the burning crusade
the wrath of the lich king
mist of pandaria
good old vanilla
I vote Burning Crusade.
I have played every expansion of the game since Vanilla and while I liked Wotlk, Nothing comes close to BC.
How can people judge an entire expansion or even compare it to others after a couple of weeks?
WOTLK I enjoyed alot. the continuation and wrap up(?) of the Arthas story was what alot of people had been wanting for a long time. I love the norse theme. Cata.. was... okay... probably the worst in my opinion. the begining dungeons were just.... horrid. sadly I can't really blame the developers for that. The community itself just deteriorated and refused to adapt to the CC mechanics. It was a ragequitapalooza. I never got to kill LK as I had stopped raiding late TBC.
MoP I am enjoying. the dailies are my only real gripe with it. I just now hit revered with Golden Lotus. I just can't bring myself to hit those dailies every... single... day... but If i eventually want my 6 rep based enchants I gotta do it. it's a little better now that I am doing shado-pan and august celestials but I imagine after the first 5-10 days of doing those that I will be avoiding them some days. I've never been big into dailies. I think they serve a purpose. they just aren't for me. but If I want to max my profession and be competitive with it, I have no choice,. there is no other way to get rep or the recipes other than to grind rep through dailies. Even with double rep gain on alts thats going to be painful on 10 max level characters. So I am picking and choosing very carefully the order I level up my alts.