The graphic in the header is slightly pixelated the header would look better if you used high quality images. And I think you should change up the color scheme to make the forum look more unique.
Yes, seriosuly Header and logo part looks messy. You need to get a better template and design for this, than it might look good.
I have just visited your site looking quite good, nice layout, I like the banner and change the banner width upto its maximum..