I would not say it's p2w game. It's just horribly unbalanced. If you want to push higer gem levels/augments you HAVE TO PLAY certain classes. That is the reason you see all the time people asking for "+2 wiz 85s" in communities. No, they won't ask for a barb. Because if you want to win and push higher than other people you have to play the strongest class in a 4 man group. You could say that this is "wizzard to win" or "necro to win" which is the dlc class but the true problem here is diablo 3 developers unable to balance and fix the game.
About the necromancer, the real question is why did inarius got nerfed to the ground and trag'ouls didn't. It just shows blizzard logic and that they didn't test the product enough. The challenge rifts don't add anything in the game outside 6 min grind every week for some bounty mats. The 2 new maps are quite bad for rifts. Specially shrouded moors for nephalem rifts, which has no density at all.
It's just dissapointing overall.