I really don't understand the bad reviews. I didn't grind at all for the first boss and took him down in 3 tries. I lost the first because I didn't know about his second phase and the second because I didn't adapt for his second phase. The 3rd time around though, I was extremely aggressive in his first phase and calm in the 2nd. Everything after that was pretty easy, save for a certain bird enemy that seems to drag my camera endlessly.
My advice is this. If you're struggling with this game, then it's probably your approach that's the issue. I won't say you're inherently bad or you need to "git gud". You've probably gone into the fight with preconceptions that got you killed and because you got upset with that, you became stubborn and are having a harder time to adjust. It's not a perfect game, but it's certainly not this unyielding hellscape it's being made out to be. I certainly don't believe this deserves anything less than a 4 out of 5.
Also, pvp is mad fun and I'm hopeful as time goes on that I will have a larger population to terrorize. Best of luck to all of you!