So, my Priest dinged 85 and I got the 329 item level requirement to go pewpew heroics. I entered the queue and got to Blackrock Caverns and thought to myself that sureley the first dungeon of the expansion is going to be a cakewalk even on heroic... I've never been more wrong. First boss went down fine, easy tacts and not too harsh on my mana, second boss we had a wipe, but took it down at the last second on the 2nd try. Third boss: WE GOT DEVESTATED! 10 tires and we got to 50%, the AoE and the share amount of adds are -insane,- ended up with group dropping because people got sick of it. I resigned with 2 RL friend Mages and got Stonecore, first trashpack and we were lying dead on the floor in like 30 seconds, again the AoE from the mobs were like a train hitting all the DPS in the face at the same time. Please Blizzard, do nothing about this, I love it!
TLR: I love the new heroics, if anything is to be changed then maybe loosen up a little bit on the AoE dmg, the mobs in heroics are AoEing my groups like my groups AoEed Wrath. =)