And you were able to do it back in Cata and back in TBC.
Sure, some group comps made it easier, but it was doable on any tank, healer, 3 dps group.
Granted, if you had no (few) CC's*, you should expect to wipe there and there. That seems right IMO. Group balancing is/was (and should be) important to do progression path content (heroics dungeons).
* NOt an issue at this point since most classes have at least one good CC spell.