I have tried all 3 speccs. BM is currently lowest of DPS of all. With my gear I did 6,5k DPS on dummy, as MM I did 8,5k and as SV I can go over 9k. I have pumped mastery on all speccs and it seems that pet on BM still doesn't hit so hard as it should. Problem lies in focus fire talent. We lost a lot of haste that was bassicaly given for free to hunters. When you press focus fire, you take stacks of haste from your pet and you get 15% haste. Everything good and nice, but pet DPS goes down. THis ability shouldn't take away stacks of haste from pet! Other problem is crit, hence it doesn't do so much. Your pet doesn't get a lot from your crit rating and stacking it is just bad. BEst is to have enogh haste and pumped up mastery as much as you can. As BM your mastery give more damage from your pet, if your pet is dead or CCed then your DPS sux = in pvp that also means you are dead. BM is not so good for pvp as we all think it is. Yeah I perform pretty nice, yesterday 9 KB 1 death in AB, but still pets have problem and I can only thank to healers and other teamates that have kept me alive.
MM is crumpy as hell. You need to steady too much to get that aimed instant and when you get it, it's just maybe 13k crit max. In pvp you will probably never get those stacks and only way to fire aimed is from being camo-ed and ambush enemy... Also it takes too much focus so be prepared to be focus starved a lot of time and a lot of talents are just plain useless. I dunno why we have readiness coz only good side of it is to reset CD on traps.
SV is currently most easy specc of all. If more than 3 mobs just trap launcher explosive trap and multishot then spam cobra and explosive at will. If single target just serpent sting and spam explosive and cobra and ofc black arrow when off CD. You will probably never focus starve, sometimes you can basicaly even use kill command when you get L'n'L proccs. In pvp is pretty fun with mirrored blades and detterance
I have managed to to kill a arcane mage with that coz he blasted me and he got hit by it for 30k damage back. I was laughing as hell. It's even more fun when you see priest or lock trying to DoT you, but they just DoT themselves
Oh I also forgot: as BM under BW you can be CCed. That means as soon someone will see u red you will get CCed so BW is mostly useless now.