fury war is hot garbage so its not easy to perform well because the whole spec is trash. frost dk is extremly setup based otherwise you do no dmg. ret pally is fine
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i was about to say this too. arms warrior has a very high skillcap at least in arenas. you need to read the game and position yourself right so you can use the intervene reflect or banner for your team. its maybe easy to learn the rotation but if you end up being an arms warrior who only deals alot of dmg, then you are trash. arms has alot of utility that isn easy to use and requires good game knowledge and reflexes.
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i'll try to give you a detailed list for a non rated casual environment aka random battlegrounds or even world pvp:
Melees:
S Tier:
Ret - high damage, bubble, short cds, good selfheal, tankiness only with prot pally legendary and prot conduit, can be kited, easy rotation, can hit on range with some spells, kyrian covenant can oneshot ppl (4 judgements in opponents face for 5-8k), can play with short stun, repentance or aoe blinding light. good utility for group members with sac, sanc and bop
Windwalker - highest burst in the game with xuen legendary, alot of mobility, great toolkit with disarm, portal, fury fists dodge, ring of piece, aoe stun and paralyse - can easy be killed in stuns or without karma/wall, is squishy in general i would say because karma isnt as strong as it was in bfa, also pally meta is generally not good for ww because they can bubble or bop karma off and then you are dead.
A-Tier:
Arms - good/high damage, high utility toolkit for group members (hp shout, intervene (reflect(, mass spell reflect with legendary), aoe fear, stormbolt for target lockdown, 3 of the 4 covenants work fine (venthyr, kyrian and nightfae)
DK - both dks work fine in bgs i guess, you have the same covenant on both specs so switching for some variety is fine, frost is big into other melees and no one can outdamage frost in a melee cleave setup because of chill streak, also nice control with the aoe blind, unholy i dont see very often because frost is just stronger and easier to play i would say. you have good self heal with death strike IF you can connect, anti magic zone for group support, mass grip covenant (necro) is just annoying for the enemies and quite strong, also range kick, asphyxiate and ams for survival. you can do funny plays with dark simulacrum where you steal the next spell of the enemy. dk is totally fine but i would recommend frost.
sub rogue: alot of cc, squishy, nice burst and short cds on dance (1min), also you can get hp back very fast while in stealth, stealth classes can carry flag bgs or things like arathi basin with sneaky kills on flag carrier or some sneaky taps on bases. sub rogue is also a very good dueler but defensive is limited to evasion and cloak with some high cds which makes kiting the key if its getting dangerous for you. rogue in general has a high skillcap to perform well but as i mentioned - stealth classes are fine and you have the advantage of choosing your opponent and not the other way round.
B-Tier:
enhance: good damage if able to connect, 3 min big burst with ascendence, one min big burst with windfury legendary, good heal but can oom quick, can be kitet very easy, alot of utility with totems (grounding, tremor, healing stream, earthbind), ascendance paired with windfury totem is just game over for anyone without defensive and it makes so much fun to see people getting shredded by some nice stormstrike proccs, only 1 defensive outside of the offhealing which cant be used in stuns, enhance is basically a dead man if kited because you dont get procs for self heal unless your wolves are helping you. rotation is very easy
feral: stealth class again, alot of self heal, can clone, bash, maim or rake stun targets, 3 min cd for berserker, if you play convoke its easy to oneshot someone without trinket in a bash or a maim which feels nice, fun to play but less impact then a rogue i would say, can kite pretty good and disengage combat with sprint/bear sprint/roots + self heal. high burst potential with convoke and moderate dmg while no cd's are available. not a bad pick tho.
DH - high burst potential with covenant ability "the hunt", can crit for 16-22k, good mobili
ty, squishy while out of demon form and if you dont have the darkness legendary, ohterwise a very fun class but it is just not as good as it was during legion and bfa because you lost the blade dance dodge ability, range kick, single target stun, aoe stun and an incap - the rotation is also very easy to learn
Survival - cant say anything here but that survival is pretty weak
combat rogue - literally no one plays this
assa rogue - idk, noone plays this, could be fun with big envenom oneshots
fury war - stop it
i wrote it in like 5 mins without rereading every sentence and just wrote what came into my mind, dont be harsh with grammar pls