Dunno if anyone grabbed by the Captain's Slave noticed, but you're not actually stunned, you just can't move. So long as the DPS and Tank keep the other adds off whoever's grabbed, there shouldn't be any trouble with that part of the fight.

The boss I had trouble with was the first one. Does anyone know if there's some sort of gimmick to the fight, or is it just a hardcore DPS race that you have to throw everything and the kitchen sink at in order to win? My only victory against it felt like complete and total luck...