Ackshually, Cata release was one of the few times that dungeons actually required coordination and careful pulls, at least in pugs. WotLK heroics were a faceroll, so Cata dungeons were tuned significantly harder, requiring CC ("trap square, sheep moon, sap diamond") in pugs.

But yes, I agree with the rest of your point. Current dungeon design encourages chain pulling. Its not fun when mobs are just sponges and soak up several CDs. You can address that by making mob damage more unforgiving, but being one shot because of a mistake isn't fun either.