One of the major parts of any MMOG is that the gameplay has to fit your playstyle. If it doesn't then you can bet that you won't be playing that game for long. Warhammer Online: Age of Reckoning is no exception, regardless of how good it might be. When a game doesn't make sense to you with how it plays or it has that "same 'ol same 'ol" feel to it, it can be boring, frustrating, confusing, (insert appropriate adjective here). One way game designers overcome that feeling in a game is to allow you, the player, to take some modicum of control over your character and choose how he/she will specialize for your playstyle in whatever game you're playing.
If you want to do more damage, you can specialize in skills that will add to your DPS. If you like being able to take the pain, then skills that stress damage mitigation are key. If you're a healer, then you obvioulsy want to boost your healing ability (unless you're like I am,then you go for more damage and toss your friends to the wind!). And the list goes on and on.