Originally Posted by
Osmeric
Both Ulduar and ICC (even with 30% buff) were too difficult for a substantial number of players who attempted them. GC commented that Ulduar was the most poorly received raid in Wrath.
In Cataclysm, many players didn't even get to the raids before bailing, given their experience in heroic dungeons. Overall completion numbers, even of the N mode raids, were bad.
Ruby Sanctum should have been a warning to the devs that their direction for Cataclysm was going to crash and burn.