I laugh at people saying Blizzard "dropped the ball" on raid content in Cataclysm. Cataclysm had its faults, but they certainly weren't the raiding part of it. As someone who has raided all content since Vanilla as current content I can confidently say this is the best overall expansion for raiding they have released. Tier 11 is the best raid tier ever released. Tier 12 has the best boss ever released in Heroic Rag and Firelands is overall very good. Tier 13 is above average across the board in terms of boss mechanics and enjoyability of the bosses.