In my honest opinion, it isnt doing very well atm. I am ilvl 626 and I am constantly oom in heroics. Especially struggled on Upper Blackrock spires, I especially struggled on the boss that is in the rookery with wave after wave of drakes. I was kicked from that dungeon 3 times on that boss, because I went oom and wiped. I had to try 4 times to make silver in proving grounds just to qualify for heroics. I kept going oom near the beginning of wave 6 in silver trial. I am hoping for some big changes in the just released patch, you should ask this question again in 48 hours, once we have tested the new release.