I hate, hate the word clunky. it is so overused. And i disagree with you that MM is clunky in pvp, but to each their own.
MM hunter can do decent 1v1 and in arenas, but it BM outshines it due to obvious reasons.
I have managed to get somewhat decent rating in 2s with a pug feral, but i have not played much competitive pvp since i cba using LFG.
In 1v1, I’ve managed to win against all classes except druids, feral mostly. They are basically immortal 1v1.
I don’t know if you have any specific questions on what to do and how to improve, but my general advice is improve your kiting and worry less about dmg at first. Try not to blow your wombo combo at all costs. Try and bait some defs with only Trueshot, and use DT+ES+RA+RF combo after.
Double Tap and and Resonating Arrow (which you should be playing a MM, I strongly stand by my opinion that Venthyr should ot be chosen as MM) both have duration, so donetuse them asap, see if the enemy will use something against you (like disarms). Usually, when they see the big blue aoe, they expect big inc dmg, but you can delay it a bit.
This wont work in high rated arena, but sub 2k and in duels, what I did was fake cast AiS with DT, so they use their defs or interrupts, and then you have your double RF rdy.
I’ve found mages to be one of the easier targets for 1v1, since our dmg tears trough them and we have proper cds to counter Combustion. Not sure how it is going to go against frost, it’s been a long time since I’ve dueled one.
Against rogues it is a matter of timing your trinket and defs, but it is hard. Ferals are impossible to beat unless they are semi afk, but feral is basically immortal rn in 1v1 (and not too far from that in arena). Against rogues, practice trapping their SSteps, but this is something that comes with time (i suggest watching Jellybeans video on MM, he makes it seem so effortless).
Against other melee it is manageable. I’ve actually found arms to be easiest to kite - there is a reason why there aren’t double dps with arms warrior - no matter how overtuned they are, they need a healer!)
Don’t blow all your kiting tools back to back, try to space them and keep concussive shot as much as possible. I think the new concussive pvp talent will help us greatly against melee.
Against spriests and aff locks, always abuse Craven legendary. It is ridiculous. Against most other specs, honestly, Surging shots will make your burst much better, and give you some increase in sustain as well, and you can still pick FD pvp talent to soak big spells/abilities
(one of the most satisfying feelings as a hunter is FD soaking the Hunt or Divine toll).
Don’t trap on CD, and don’t overextend to trap. This is mostly an arena tip. In 2s and 1v1 don’t be afraid to use Scatter as a self peel, or to at least get that 1 AiS into scatter on your kill target. I barely use scatter on healers in 2s anymore, unless as an interrupt.
Hope this helps, and i am by no means a pro pvper, quite average actually. I deffo suggest Jellybeans, watching him play hunter is really really useful for learning.