I've never been much of a fan of MMORPG's, yet I have played WoW for a shiatload of time (which, in retrospect, I seriously regret), mainly for the storyline and the PvP'ing and to make the permanent whining of classmates stop. After having grinded my Nelfy Priest to level 70-80-85 and all the gearing up for PvE and PvP, having downed the stuff you needed to down, achievements become the interesting thing in the game, which also is a massive grind. So I've pretty much quit the thing, because frustration > fun, also because Cataclysm is poor when compared to Burning Crusade(which was the best expansion for the bloody game).
Tl;dr, I'd rather spend my time studying and enjoying myself with a more interesting game with less grind, such as Portal and Mirror's Edge (and whatever RTS you can come up with).