I used to do web design, so here is my feedback: I'm conscious I am probably just apprehensive to "new things", I was not really particularly attached to the old appearance, but my immediate critiques are thus:
1) I don't mind the color scheme
2) I like how prominent the thumbnails appear
3) I would prefer if the header and body of the page are different colors rather than just being separated by a thin line, but in terms of overall design this minimalistic approach works well.
4) Profile pic seems low res, probably been talked about lots already. I also agree with previous commenter that profile pic doesn't need to be on each mod thumbnail
5) Too much white space, mod thumbnails seem a bit large. On resolutions 1080p and above I could imagine easily 4 to 6 columns fitting well enough (or whatever the old layout had).
6) I like the gradient, I suspect there will be some sort of 'theme' selection in the future?