(I also use nixos too but I use nix plasma and arch hyprland, i mean I barely use nix, arch is my goto but you get my point)
I agree it has buzz but its just cool open source software man, I like it. it isn't as plug n play even still as plasma or gnome for example but that's the point. Makes for a really good minimalist system but for me somethings don't usually work that "just" work on other desktop environments but I learnt a lot and now its a really enjoyable experience.
One example I can give of where I really had a big issue with hyprland was consistent schema around every application. I think its still broken on my system for qt apps which I had fixed but then broke again I think, but I now don't have the time to fix it and its a minor inconvenience at best. nothing wrong to hyprland, that's just fundamentally how it works if you try hyprland like me.
Omarchy seems to be promising the premise of hyprland with "it just works" Maybe if my arch system bricks, I will give omarchy a try. Untill then, I am happy with my theme and hyprland. Its cool. Dhh is also cool for making omarchy tbh.
So many of the criticisms of Wayland around the internet end up being things that Mutter doesn't let you control directly.