Prot or not?

Hello everyone.I did ding with my warr 85 few days ago and i wanted to be prot, but a friend said that prot is bugged on this cata server(mastery)!?

yes critical block from both mastery and shield block are buged better tank with some other class for now.

Yeah i started lvling DK, is that a good choice?Not bugged like warrior prot? Ty for reply.