I agree, it seemed very well done. The problem with it is also it's greatest strength though.
I was with a group who was, less than stellar, I was healing. We managed it, but not without me provided emphasis CC and target marking. It wasn't a problem, just felt like I was doing more than my fair share (especially when they chose to prematurely attack the CC and break it).
I am not saying nerf it, the problem is the difficulty in comparison to the prior Heroics. Never has management been a huge necessity in them. This one comes along and with no tank it was very strenuous because there was no aggro management and I was getting pounded.
Somewhere in this writing I know I liked the Heroic though, I promise.
Perhaps less mobs outside the instanced area would have helped, that was where majority of the problems were.