I'm assuming that we're disregarding the one boss mini-raids like EoE or Mag for this discussion. Although, I'm not sure I like DS any more than the mini-raids. But my opinion seems to line up with most other people's. Kara, ICC, Ulduar, and Firelands are my favorites, in no particular order. BT, ToT, SoO, and AQ40 are probably my next tier. Which expansion would you guys pick as your favorite, if you're only considering raiding? I think I'd go with Wrath. ICC and Ulduar easily offset the mediocre-ness of TotC, and the half dozen mini-raids made it easy to fill raid time if you finished early. MoP is a close second. I don't think there was a bad raid this expansion.