While you don't have to put a lot of time into WoW , it doesn't give you a whole lot to do with that extra time.
The spells and abilities are generic, though the players will find different ways of combining them to be more effective in PVP, there not really more fun compared to other MMO's abilities. You'll get a few a cool abilities now and then (Feign Death, Portals, Morphing into an animal) but nothing that will keep you playing for a long time.
You will spend the majority of your levels questing or grinding, at first following the quests storylines can be fun, but as it is with other MMO's, they get repetitive and have you spending more and more time travelling as you get higher level.
PVP is the same as it is in any other game, perhaps lesser, and to be good at it you'll probably have to spend your time in dungeons hoping for armor sets.
The battlegrounds are O.K, and consist of Capture the flag, Taking over bases, and..well, killing. But paying monthly for Battlegrounds isn't really worth it.
After games like Star Wars Galaxies, with proffessions like entertainer and any of the crafting classes, and PVP like Dark Age of Camelots, World of Warcraft seems lacking in features.