The new design is OK for the front-page.
But not the Forums! It's really hard to read new posts now and as cephalos said, it's much too dark. A lighter brown might be OK, probably mixed with some other colors, like green or whatever.
However, the current Forum-theme just sucks. That's what I voted for.
It has nothing to do that most people are generally against changes as soon as they notice them but it rather based on valid arguments:
Posts are too difficult too read and at a side-note:
The brown looks like someone dropped a huge load of sh*t over the Forums. (OK, the last one might not be 100% objective. )