what needs to be looked at is hunters.
that class is the perfect example of flying under the radar.
they cant be nerfed too heavily because then their pve damage will drop off, but something seriously needs to be done about them in pvp. a hunter should NOT be able to kill someone in the duration of pet charge stun and pet web shortly thereafter. and forget trying to even catch a hunter now, since they have knockbacks and all specs now have readiness (or wtvr that CD reset ability is). not to mention stampede, which is just broken as fuck.
if a hunter gets to summon all their pets at once with no cast time then mirror images should deal more damage, rogues should get a shadow assassin (like the D2 assassin ability), warlocks should be able to do stampede with their demons, shadowpriests should conjure 10 shadowy apparitions that are invulnerable, dks army of the dead should be instant, and summon twice as many ghouls, must i go on.
this just falls back to blizzard failing to balance pvp and pve effectively. again. consistently. for 8 years. theres a reason i havnt pvped seriously since wrath began.