I usually remain a lurker on all of the sites I visit but I think this time I'm annoyed enough to scream into the void.
I'm extremely against this new design. It achieves less while taking up more space and the contrast/design actually hurts my eyes. It screams mobile UI and takes away a lot of the website's uniqueness, it's just like I'm looking at Crunchyroll or Curseforge which are UIs I'm also not very fond of. Some particular things I'm taking issue with, in no particular order and off the top of my head:
The game at the top of the page is unnecessary; I'm not stupid, I know what game I clicked on, and I can see it anyway in the top bar. The hot mods section shows 6 instead of 7 mods. Hot mods and collections are far too large and I am forced to scroll down to actually browse mods. Collections are useless for anyone who isn't using Vortex. Mods on the front page are displayed as rows of 4 and only 16 are shown, less than the old UI. There's big portions on the side which are completely empty. Several parts of the site are still using the old UI and it's extremely jarring to go back and forth between designs. Game-specific colors are gone.
I don't understand what was so wrong with the old design that we needed this new one. It worked, and worked well. This feels like change for the sake of change rather than actually contributing anything of worth, and there are issues on this website which need fixing, such as comment search, that are far more important. Again, this screams mobile UI and I don't know why you're going for that when this is a website for modding PC games. I wouldn't have been so upset if this was a mobile-exclusive UI/look, but this works nowhere near as well on desktop. I'm using CSS edits made by others and it's made things better, but not by much. It's hilarious that now I have to mod the modding website.
At the bare minimum, this UI needed a lot more time in the oven. It would be great if we could have an option to revert to the old UI much like how Reddit still has old Reddit, even if you don't support the old UI anymore/as much as the new UI. The short time that the /games/ trick was available shows you can have both UIs up at once. I know that for now I'm definitely not going to be buying Nexus Premium.