I just don't like gray themes, especially when they have too much solid gray. It's just a bit dull and uninteresting. That's all. It isn't down right ugly.
Tbh, the first things I thought when I saw the theme was "dull". I know you can change the colors of the skin, and it's great how the banner changes along with it, but it's too generic.
I think you should look for another skin, preferably a fixed skin. I'd recommend a light theme with some black and blue.
I know you like the skin because you can change the colors and the banner, but that alone isn't enough to get you members. Go for something more sharp and clean (like this sites skin)
There's only one problem (that I can think of), I haven't found a nice gaming theme yet and most of my members like the current theme. So that's a bit of problem. Any suggestions?
The banner is nice with all the characters blended in, however get rid of the border, make it transparent, or at least make the border black. Its a great banner, so make it the thing which brings members to you. Make it blend in and you will see it looks better. The nav bar's choice of font isn't that great, as well as the category headers. Try to keep a consistency in font around the forum, so a font like the banner could be used for the cat. headers. You have a great amount of "appropriate" forums and its easy to flow through.
Overall:
7/10 - Pros: Banner design, layout simplicity. Cons: try to blend in the banner, font choice, font size
I hate that you need the /forum extension on the end. Why not just redirect the gaming-zc.com address there instead of having it link to the old forum? It would be a lot easier to access that way. :S