I totally agree. Its appearance resembles the color scheme of OS X itself, which is much more appropriate than the brown. Whoever made this choice, it was a good one!
It's nice looking but I think the old beige and brown was nicer... But i think it's just because I had got used to it. I need to acclimate to this new enviroment.
By the way... where did the little reply box at the bottom go? I miss it