Why is that any concerns raised are cries about butt hurt and whining about being a bad player?
Lets take a look at an example, excuse the use of logic here.
50 PVP geared player vs 50 casual player.
PVP geared player does 10% more damage and takes 10% less damage so casual dude has to be 20% better then the PVP geared to break even. So after 50 this patch has killed casual PVP unless the person does not mind lossing 80% or more of their matches as they can't outdamage the other guy. And I'm not even bringing into account the 1k or more health they may have being in all purple.
So really quit with the learn to play crap or you're not good as those apply only when all things are equal, which in this case you can see they are not.
TLDR version - Expertise imbalance makes post 50 PVP extremly difficult for casuals.