I fully agree that the new UI is too dark. It ends up looking way too cluttered, and i keep having trouble distinguishing between the "cards" when scrolling mods. The whole site is now causing a lot of eyestrain, and i simply can't use Nexusmods for any longer than a few minutes at a time to look for mods because of how annoyingly straining the new UI is on the eyes. I desperately hope that we can get some more neutral and less intense use of color, especially as mod authors add color to the site themselves through the use of the mod thumbnails. It almost feels as if these thumbnails weren't considered when updating the UI. This update comes across as a whole lot of work for no reason other than making an otherwise good website worse to use and access.
