If you want, just read and realize the following to quit wow:
All you do over and over is go to questgiver... get quest... go find mob... kill mob with same 3 or 4 mind numbing button mashes... travel back to questgiver.... rinse, repeat 1000 times....
Same mindless crap over and over and over with different forms to make it look different.
Dungeons can be a diversion but that's the same useless crap over and over too.
How about an ai that's not so freaking dumb that it doesn't just see you and lumber after you immediately.
The ai in this game is wicked dumb and if you look at my point above it's an excercise in the mundane.
There are some creative quests and some interesting things to do but it all turns into the same crap after a while and the best part of all, you loose hours and hours of your life and pay them to do the same thing over and over. They have just duped you into doing it because the questgivers have different names and are in different locations, but if you take the mask off, there all the same and the mobs are dumber than a rock.
Ok try reading the above and thinking about it a few times, worked like a charm for me. : )
Since you have the pc try some intelligent games or games with better ai like FEAR, HL2, Civilization 4, NWN, NWN2 (soon), Oblivion.
Another thing about wow is it really isn't even an rpg. The stories are weak and the questlines are uninteresting. You never get that epic, caught up in a story feeling, you do get that "I have to grind to 40 to get my mount" feeling though.
You get your mount, ride faster to do all the same useless boring crap you did before at a slower pace.
Ok enough of my rant. Good luck. : )