I'm not sure why everyone keeps bringing up WoW as a comparison, as if it's some kind of a measuring stick. There are some positives and negatives about WoW, just like about any game. Some things about WoW's wars are fun and some are not. It depends on so many factors that it would take typing up a lengthy review of the game just to touch on them.
However, take a look at Warhammer. That is a great example of fantasy, and now an upcoming MMORPG, based largely around wars. As it is said about Warhammer Online - "War is everywhere!". Warhammer is anything but boring or unsuccessful, whether it's reading a book, playing its tabletop, RTS, RPG or MMORPG based on it. It has first appeared in 1983 and has been going strong ever since. Take a look at MMORPG.com, it's the most anticipated upcoming MMORPG. Here's a video of Paul Barnett talking about the type of quests Warhammer will have (you can actually go through the whole game either solely PvE, PvP or both):
Warhammer Quests (opens a flash video within a website)
Does this sound like cliche or not fun to you? Not to me. In fact, many are saying that "WAR will kill WoW", when it comes out.
For some reason, people are always taking wars in games literally. When you play chess or any sports in real life, each side has an army or a team battling each other, each side can win and defeat one another but you are not physically killing or dying, and most importantly it's fun (just ask Kasparov

). Now, don't misunderstand me. I only posted this because certain points about wars in games were brought up.
As for PlaneShift, after reading some recent posts here, I was under the impression that there will be some wars, such as between Death Realm and Living Realm, Stone Labyrinths, possibly later with Kadaikos and maybe even something on the surface of the planet or the races' native realms, if going through the portals to those realms will be possible in the future. Unless, of course, the real situation is different.
Remember, there is no story without conflict.

I'm just stating my opinion, of course.