As it stands, I don't really like the design. That said, I didn't like the previous one either.
Here are a few things I feel would improve it, if at all possible:
1. Removing avatars completely
In their reduced state, they are just taking up space and loading time. If you want to keep them in full size when a member name is clicked, so be it, though I'd be happy if they were removed completely.
2. Adding a stroke/frame around each of the 'boxes'
By boxes, I refer to individual posts, 'Reply to Thread' button, the Quick Reply section, etc. I think a border around these would make it look better, and less congested in the middle.
3. Poll background should be the same colour as the forum background
At the moment, it is white, which looks fine with the posts, in my opinion, but the poll background should match the forum background and have the text replaced with a visible, white alternative. I just feel it wouldn't contrast so negatively, along with the border idea.
4. Teams supported are gone
If this was planned, fair enough, but if not, I think they should either be alongside or replace our custom user titles completely.
5. Advertisements are back for me, as a Premium Member
Not really a design flaw, but something to look into.
Thanks, and although the majority of people would prefer this changed back to the previous skin, I think a few additions/changes and it'll be better.