Well, I just started playing WoW myself for the last couple of days and I am happy to give my opinion!
MMO's can really irritate me as people get either too role-playish and you feel like you are in a Ren Faire, or people get too much into power-leveling their characters and they just act like idiots. Thus far I have played Shadowbane, Asheron's Call, a little Star Wars (hated it), City of Heroes, and now Warcraft.
Warcraft thus far has been good fun, and the environment is quite pretty. One thing I like is that they really strived to maintain the sense of humor that I like about the older Warcraft games. There could be more variety in the looks of the characters, but so far I am enjoying the game quite a bit. So far I really have only played by myself, so the game feels less like an MMO.
Oh, and the game could use a little more cow bell.
My 2 cents!