yeah ive always felt a little sorry for hunters. they have always basically been on a knife edge of balance for pve/pvp. its why ive never wanted to main one.
you look at BM at launch of pandaland, and they were freaking retardedly OP. yet in pve, meh.
same with wotlk when it shipped, double TBW because of readiness, with the glyph that extended its duration and BM was absolutely atrocious. then it got hit with the nerf hammer soooo freaking hard, it wasnt usable again until midway through cata.
blizz have historically been overzealous with there nerfs, thus why during a lot of BC and wotlk blizz were known as " knee jerk " nerfing everything. they couldnt do it in small parts, they just gutted classes/specs entirely. they wouldnt just fix a single problem, they would tear down entire specs to uselessness.
it happened to DKs at the start of wotlk ( because lets face it, S5 was a joke, the internal testing from blizzard failed, and the player feedback from wotlk beta was entirely ignored ). DKs shipped atrociously broken, either as a marketing scheme to drum up attention to draw back players, or if they were that inept at balance in the first place. we will never really know. then DKs spent basically 3/4 of wotlk licking there wounds. hell frost only became playable again after ICC came out ( frost DKs were gutted into nothingness during ulduar ). blizz just ripped frost apart, destroyed glyphs, destroyed abilities, bugs galore, pestilence wasnt working. they just kneejerk nerfed into oblivion.
these days though, it is harder to balance because of fundamental changes to the game and how specs work. instead of small percentage based nerfs to modifiers, to tone down some specs, blizz have to be very careful because of pvp/pve balance. as of right now though, a lot of the problems is boss encounter mechanics shutting some specs out, or pvp balance holding specs back.
we can only sit back and watch.