How is Unholy DK doing in pvp?

I'm new here and as always i would like to play DK, but since this is a pirate server sadly there are bugs.
I would like to know if Unholy is viable in pvp with the current bugs that it has. Does it rival over melee classes like it should or it falls behind because of the bugs. I know Unholy is kinda like Affliction Warlock, those two specs have always been the buggiest in all the pirate servers I've played through the years, but still is it worth playing here?

P.S I am playing on Lordaeron.