A good game should be the one that makes happy most of the people (nobody is perfect) so it shouldn\'t be just Hack & Slash neither be only Role Play... you should have both, so you can attract all kinds of players...
suggestions i have that improves the desirability are these:
more than just the alls basic stats, when you have more stats to work you play more and play on a more diverse way (adding luck would be nice, it would help or penalyze a little on the other gains, Will is a good put, courage would also be nice by making you flee if something bad happens or giving bonuses on berserker acts... thats goes on...)
Charisma should not be just a idea that doesn\'t do a thing, it should really change your gameplay, like npcs be eager to talk with persons with high charisma (if they like you they will trust you and talk more, do more details about the subject or if you are too ugly the can be scared and run, refusing to talk to you) it would modify you chances to get a big deal when you buy or sell things, when people see your description it could say \"Ugly Mr. Hazbahal\" and all other uses of this so ignored stat...
also i think that should have plenty of quests scatered on the world (not only H & S ones, quest of deliveries to be done, people to give you hints when you are on a quest, crime solving and all those things that changes your play , making you stop for a while to just being a level raiser to really explore and discover the secrets of the world
PK should have, the idea of the outlaw flag is cool, but the idea of 5 min penalty in my opinion is awful, everyone hates to be stuck... the better idea is that if you are an outlaw you will be attacked by guards and peacekeeper creatures (you become the main target) and will be target by other players because they can kill you and will not be outlaw... (with that a bounty system cam be used to be a good reason to hunt outlaws, that will make groups of players to joinf forces to attack the outlaws wanting the reward)
the improving of the char should not be just \"you rose a level so every stat you have has improved\" it to improve the game should be based on what you do (it\'s pointless to gain more mana just because you killed many enemies with a sword, you should improve your mana and spellcasting by using it... it helps a lot in making the players more diverse if you want to improve your magic, use magic, to improve strenght use it... just like we do in the real world (i know it is not THE real world, but follow principles helps the player the \"enter\" the play
well, i wrote so many things but now i have to go... more to come when i return...