The fact that 5mans dungeons while leveling can be done while healer is asleep up until Cata dungeons is so dull. I can understand zone leveling posing little challenge, but what's the fun when even bosses are hardly any more challenging than a mob with a little more health? Honestly, a flat +100% buff to health and damage of all dungeon creatures below 80 would probably only make dungeons more fun. You know, perhaps the boss might deal enough damage to the tank that he needs more than a Flash Heal.
Bad enough that 75% group damage is from Consecrate and other tank AoEs.