Nice Post, Golbez and many interesting answers. A topic, which will come up in every MMORPG some time. But who can really answer the question for _the_ playing style?
First let me introduce some phrases for the different styles of \"RPGs\", which i will then declare as short as i can. These are by no means the _correct_ words, only my personal classification. I want also to distinguish between single and multiplayer, because of the complete different playing style.
Single Player StylesAction AdventureThis is the typical Zelda game. You use your items in the game environment, and these items are _real_ different. There are no sword and sword+1, but a grappling hook, a lantern, a bow with fire and ice arrows. The items are no decorating accessory, but used for the many, many riddles. There exists some conversation, but only for nothing. The central game play is based on the numerous riddles and on the hordes of fights against different monsters which needs different tactical work. The fights are done on the same screen like the other game play and in real-time. Other examples for this games are Metroid or System Shock. BTW, i like this style, these games made it to eat my spare time and Zelda will be my all time favourite (thx to miyamoto)
Roleplaying Game (japanese style)Do you ever played one of the Final Fantasy or Dragon Warrior titles from square and enix on the old consoles. Incredible lovely music, diversified, astonished and tearfully story line and tactical group fights on an extra screen. These games did a nice job killing my sleep at night. The game play sets its focus on the simple town-equip-assignment-dungeon-town... circle, but perfectly hidden by the varied kind of quests, fights and items. BTW, i like this style, final fantasy II (the japanese part IV) is my all-time example for a story never topped by an other game!
Roleplaying Game (american & european style)The Ultimas, Wizardries and Bard Tales of the world. (Take out Pagan and Ascension!). Board, Attack, Ready Weapon, Talk, Ztats... the functions and possibilities of the old ultimas were rich. Do you remember the chain of grain, flour, bread = food in U7? The conversions were deep and rich. The fighting runs in an (relative) automated way. The story was non linear. Do what you want. There was a bad boy, of course. But you can also play only for fun. Many side quests and good developed NPCs. BTW, i like this style, it was the first time i get an idea about what is possible on a computer in a virtual world.
Mixed Single and Multiplayer StylesRoleplaying Action GameDiablo and Dungeon Siege are in this categorie. Hunting for items, for levels, for skills, for xp. Killing all and everybody. No deep story, no big conversation options. From town to village (or better from smith to smith). Selling and buying/finding the best items to use. Leveling up is the important thing. BTW, i like this style, but i don\'t know, why

. But, sitting in front of the monitor at midnight and thinking: Only this dungeon, then i will go to bed... but when the sun rises, it sees me sitting already in front of...
Multiplayer StylesMassive Multiplayer Online Roleplaying GameHm... i think, i must distinguish between three big parts of MMORPG - Ultima Online (the beginning), Everquest 2, Camelot, Horizons (the nowadays) and Neverwinter Nights (the - in my eyes - only real MMORPG _try_). The first one i never played. But in discussions you here always the same statement. The new MMORPGs are so nice looking... if only Ultima had this amazing graphics, i will never play an other game. And why? Well, UO was the first one, which gives the player also the oportunity to play as a merchant, as a beggar or any other _ROLE_ without(!) the main focus on the skills and attributes. The newer ones are already on their way to enhance their crafting system (which gives the player a base for true roleplay). But the problem of the newer ones are, that they also have to provide a way to be a hero... cause the players must pay 12,95... and many of the buyers want to get something therefore. But a consistent world can not live with only heros... and there comes Neverwinter Nights... Ok, i will go a bit deeper in this topic, because i worked on a NWN Server and i now the RP-Problem there rather good.
At first, i must remember Bioware: They tried it, they really tried it.. but they lost in the comercial mills. (That is my theory!) They tooked the D&D RP System, which is really not the best system out, but well known, widely accepted and since the 3rd version relative \"round\". And then they want to port the P&P style to a computer MMORPG... and this could not get right. P&P is at least a single campaign on an play evening with friends. All players are heros!!! That is the centre of P&P - adventuring with a hero group to resolve a quest. And NWN is in a wonderful suitable for this. It has its editor, which make you developing an \"evening campaign\" in a comfortable and nice manner. The script lets you implement nearly all you have ever dreamed. Work as a GM is so easy and really enjoyable. Everybody can setup an own server without much network knowledge. In simple words: many good tools for you. But at least... the problem is the HERO-concept. Short after the game was out, the people made their own server with 16, 32, later 64 and now up to 96 players. And - of course - they will all be heros. For a so called servervault, you must begin with level 1 (which can be advanced by the modul builder with skripts). And fast you are on the hunt for xp to build your advanced character and to not to be too weak against another player.
At least we made a local vault server (where player can go online with their single player campaign developed 20 level char) and we made an unbelievable experience... The players comes with their complete developed and high pushed chars. But now they can not focus on development and the hunt for experiance brings nothing. That was boring.. and so they begin to ROLEPLAY... they set limits in their guilds, they developed ig rules, we have something like an town coucil, we have thieves and town guard guilds, which make really good rp... cause all are on level 20 and there is no more engine fight necessary... the world lives from their characters... nice. Of course, we do have problems with PvP, with item pushers, with noobs, and so on... these are the drawbacks of a local vault server... but the GMs do their best job.
(I must add, that Bioware with their Add-Ons made a good job: They inserted Database-Access and now some little crafting - some needed items for true persistent worlds)
Back to the topic and to the conclusion:
P&P and the most MMORPG focus to make the players HEROS... and imo that makes it nearly impossible to play roles. You need real beggars, waiters, wash womans, not only NPCs. And if you have these things all together and do not have to look for your xp, your swimming skill, if there is no necessarity to adventure and hunt monsters, if you can live in your house or wander through the world only collecting the different flowers of the world... yes, i think, that would be nice.
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And what is roleplay to me?
Some posters said: \"In every game you play (somehow) a role.\" No doubt, that is correct. But i do not think, that Golbez ever meant it this way. He pointed out, that playing a role can not have any fixed setting! And that is the thing, i like. You play a _free_ role. No written story, no min\'s and max\'s for your (imaginary) skills and talents, all is possible... just play it. Take part in the community, write the plot _while_ you are playing the game, and you will _get_ the results for it...
I will not miss my hero from dungeon siege, my link in his green skirt. I will not forget the search for the heart pieces and the run for the _best_ bow. But i will definitively not miss the experiances gotten with impressive role players some nights...
Last Word:
I have fun with all genres - if they are good packaged. And like every player i have my likes and dislikes. But the question was, is and will be: What kind of server will be PS? I do not know, if it is important, if PS will be an only ROLEPLAYING server or a HACK&SLAY server or a mix from both. I think, we will see it.. and hopefully the player get the choice to decide it...
br, Winterheaven.