They have their strengths and weaknesses, and have actually gotten quite a bit more buff with the last few additions.
My concern is that their skillset seems rather robust with respect to what they can heap on you while you're spinebroken. Lets not forget that spinebreaker itself is a serious debuff.
Its a 3-4 tick paralyze that can ONLY be interrupted by combat, for god's sake, and it seems to succeed about 66-75% of the time. Its spammable every 2 rounds, and there is no way (that I know of) around it. At least with sleep you can stack saves/eat firenewt. With orcs and spinebreaker, they can break you, taunt you, drink blood, call in a gank, wait for your buffs to fade, grapple/trample... Then do it all over again free of charge.