Ooh! A nice surprise for me visiting Nexus in the middle of the night.
Looks slick and modern. I've barely used it -- no surprise there -- so there's not much to report yet. The padding around the articles is nice: gives it a certain space, a room to breathe, without taking away any meaningful area.
That being said, I do have a couple of suggestions regarding UX:
There's no need for the "plus" on the main page's games as a menu. You only have two options there, and one is directly replaced by a more straightforward click-on-the-element-itself. Leave the plus as a button for "add to favorites", which is what it seems to should have been doing by default.
The "loading/action pending" modal that opens at every "add to favorites" (and, I have to assume, other database-related actions). There's no need for it to dim the background, be closable or, in fact, be full-page. If you're using it to indicate action in progress, indicate it right next to the action: in fav's case, right on the button, by replacing the plus with the cogwheel and then, once done, with a green tickmark. It's a more straightforward, streamlined indicator. Leave full-page modals for something that requires further input: say, a form to fill, like when uploading a new mod, or a confirmation of actions important enough to demand it.
Switch "Submit" and "Cancel" buttons around. By putting "Cancel" to the rightmost, you encourage it by implying it's a more important or necessary action. When I'm about to post a comment, the least desirable thing I'm about to have is to erase whatever I've written due to reasonably-developed muscle memory. You already do the same with "Forum Thread"/"Add Comment" and "Report"/"Reply" buttons: they're in the right order, the predictably most often used one being on the right.
That's all I've got so far. Looking forward to seeing you guys move further into the future with this!
