Zerg the pally, and force the DK/BM hunter to go defensive and peel. Make pally blow bubble, mass dispel, game.
You've gotta know you're not gonna get a lot of CC off in that game because of TBW/LOLDK CDs-you're only real option is going on the pally at first while the DK/hunter CDs are up. When they're down, a switch becomes viable.
you say it like he's gonna MassDispel when he has a BM/DK shittin all over his face. if you're gonna theorycraft it.. then the dk is gonna spam CoI on rogue, pop Antizone and have the paladin sit in there... ect, ect.
they might have played it wrong, they might have just been completely outplayed.