Best joke I've read on these boards in months! Unless you mean LFR, but somehow I doubt that.
WotLK was the expansion that best encouraged casual raiding -- of any raid, not 1-2 select mini raids, and without using LFR, which some people seem to have this mysterious vendetta against that I'll never truly understand.
Cataclysm made even entering base level raids at minimum size very difficult to get into, to an extent it practically killed raid pugging for a lot of players.
This thread is partially true though it was only 4.0-4.2 that raids were literally hurting the game, and it was because of their poor design that revolved around exclusion rather than inclusion. It's also why the raids in Cataclysm were so damn small.