I have zero complaints about this new theme and UI look. I don't mind the more simplistic looks of what the classic theme offers, but this is right up a lot of people's alley. It's still simple but offers a cool "nexus" type look with the blurry multi-colored background; the new font is nice (I think it's new, I can't tell now, it's been 10 minutes with the new theme), the colors chosen for the download page are immaculate as well, that nice darker midnight blue.
I might just be having a moment but I genuinely enjoy new UI updates to websites or apps I frequently use, especially when they have a fresh, clean feel to it and utilize the entire screen!