I haven't completed it yet but starting it directly after finishing Prey I can safely say that for me, Prey was the better game. I played the rest of the Arkane catalog and also enjoyed those more. The level design was a bit better in their older titles and the gameplay options were more varied from the get go. I can appreciate their creative time loop design but it does come with it's drawbacks. Any time you have a rogue like mechanic of losing everything and going through the same areas you've been to before, you are automatically not going to appeal to everyone. Returnal had the same problem despite being a great game by most accounts.
I also think some of the hate, if you can even call it that, is that the game was probably a little bit overrated by critics in my opinion. I like to look at aggregate user scores on sites like howlongtobeat and talking to others and the general sentiment I am getting is that it is on par or maybe a hair below the rest of the Arkane catalog which I have to agree with.
So yeah those two things, some PC performance issues on launch, and a touch of fanboyism and trolling is a recipe for some hate.