In TBC Casual's had their raids, and Hardcores had thiers.
Casuals could progress in Kara, Mag, Gruul and some might have gotten to SCC and TK.
The hardcores had BT and Sunwell. But don't forget! Alot of hardcores claims Kara to be the best raid instance in the game ever made, so why you wanna go BT?
"Casuals had their raids, Hardcores had thiers, just because they are harder, it must not mean they are more fun.