Man I gotta say, I just hit 80 yesterday on my team and i got spanked HARD in heroics. I tried Azjol-Nerub, Old Kingdom, and Utgard Keep and made it to first boss in each place without too much hassle (few wipes on trash every now and then) but each of the bosses just wiped the floor with me. I think for those of us who are controlling the entire team and running a tank+4 team, you really want to gear up the tank a bit before heading into heroics.

I'm just going to farm up the trash in heroics (and maybe try a few different bosses) until I hit wyrm revered, which should give 2 more nice plate items. Then maybe Kiron Tor revered for spell damage stuff for my shamans. I think I'll also try respecing one of my shamans resto, I've cleared all the 80 instances (except Loken, too hard for me right now) with pally tank+mage+3 ele shamans, but it might be time to respec one as resto and dedicate him to healing.