TBC heroics with fast but not idiotic "ogogogogogogogogohogo" players. Sure was nice that you had to pick the group, so idiots could be more better ruled out. Then they whispered after an hour "u got room still our grp was shit"..
Nowadays these newcomers or outright idiots learn absolutely nothing while running lfd heroics, which only require a tank that doesnt run 15miles into the dungeon pulling while the healer is on loading screen of the dungeon.