There is always a better class or gear at every lvl bracket, foxes and mages are maybe the stronger at 22,but not that op, bears are excellent too. Its easy to kill a fox with a stun or crip slash, mages have now really low hit, not even 90 if u using 2H weapon. If you hs or blind shot after heal, they will miss everything. Crits are hard but only on drain if its maxed, drain has very long cooldown, when you miss it, you loose the fight. Foxes dont have any high dmg skill like drain, their 300+ crits come from plat pack hammer auto, not from skills. Anyway you don't do 300 dmg every time, its random big crits.

Mages and foxes are the weaker at L71
Foxes are not the best at 56.
Foxes at 30 are glasscannon, can be nuked by every class.

I dont see the point on a nerf.
Only thing I would nerf is elite gear at L25 but the best thing to survive is adapt. Im lucky I have enough gold to afford elite gear, most pvpers will have non elite or just armor.