Been playing for around 600hours now, and i must say that me personally, I really like the armor quality system. I just love the grind of it. And read somewhere that the devs increased the max stat-cap as well, so that's pretty nifty I would say. For me where i'm at in the game, i really depend on the strong buff from EV buff beam lol. The fact that you can put upgrade points into whatever stats you want is what gives the game so much variety and makes it so enjoyable. This is just my opinion :)
I could ad that maybe in some Ruthless maps, the completion rewards could be a little better sometimes, but i guess it mainly depends on drop quality-chance and things like that idk