Just did this with dk tank and 4 ret paladins :P pretty easy boss fights and trash pulls...

Boss 1
tank and spank... used seal of truth and when worm goes underground just run around

Boss 2
Run and spank... Seal of insight used, paladins used follow all the time so when there was something in ground i just moved tank and when dragon goes up go to good place where you can heal your team back to fight.

Boss 3

Tanked this boss near fall, paladins used seal of insight. When boss does ground slam run your tank to legs and back to position... wait few sec and start moving your paladins away from shatter before boss casts it.
Then back to action and use all possible cd's your paladins and dk has in this fight so your mana dosn't run out.

Boss 4

Again used seal of insight used aoe rotation all the time. Run away stuff from ground and spam your aoe so that divine storm takes down adds that spawn then keep running and aoe run and aoe run and aoe and win