I actually like a lot about WoW, I just get burned out whenever I play either game for too long.
I like WoW's actual "instant cast" spells, their not-so-cryptic stats (no walls of math-text figuring out what 700 agility gives you), and the fact that mobs you hit (or don't) don't take a personal vendetta against you and chase you into the next (nonexistent) loading screen. I like the fact that their PvP (arenas and BGs, not so much Horde vs. Alliance "ganking" and the like) provides an enjoyable experience that, to me, would make a fine and dandy standalone game. I like Talents. I like the fact that, with PvP, there's more motivation to raid and get better gear, rather than the ability to do better raids to get better gear to do better raids to get better gear to do better raids). I like the fact that Blizzard didn't use a Yamaha synthesizer for 3-minute loops of all their music.
Yet I still play FFXI.