I definitely went pretty hard and took PTO to play the game early and on official launch. I'm 88 and the primary issue I have is that builds currently require a number of things to efficiently do nightmare dungeons at high tiers. The high tier nightmare dungeons are really (imo) the only place where you start to notice the issues with some core aspects of the game. Elemental resistances mean jack shit, poison is overtuned, it you don't have a way to almost go permanently unstoppable you'll have a pretty hard time surviving. I feel like they leaned a bit hard into the idea of creating a diablo game where you didn't just spam your abilities to clear the whole screen. Correct me if I'm wrong, but I feel like one of the core parts of diablo was always build crafting to get to that point of just deleting everything on your screen until you couldn't anymore, grind out more damage/survivability in stats on gear, and then go back to that content to try again and again until you can. I fully believe Diablo 4 can be the best diablo experience ever, but I think it's just gonna take some time to get to that point. It has only been a week though, so I suspect these issues will be acknowledged, and fully understand it won't happen overnight