Kara and Ulduar hands down my favorite raids.
Judging the encounters and environment only, Icecrown hands down - however I enjoyed the people in my guild and raid group the most during Karazhan and later on Naxxramas. Haven't been in a good guild since late Wotlk, can't judge Cata content fair.
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in this world full of people there's only one
and if we only live once, I wanna live with you
2. Karazhan(did at level 80, but still we enjoyed it)