Awesome man, it always boils down to play what you want! The only other classes that give crit buff is rogue and hunters that I know of. I think ret paladins can be good DPS if you can figure out how to keep inquisition up without lowering the actual buff time with a lower buff time (that is so annoying)

i did a castsequence macro that is for holy power dump and it worked well. DKs and warriors could do way more DPS than my ret pallies though. Maybe it was gear, not sure.