This is a community site for Day of Defeat:Source. I've done a lot of work with it. Any critique is well appreciated. There is a chat function that I used with cometchat. It works quite well, but I am worried that it will bog down the website. Feel free to give it a try and test it before you commit to something like that for your own website.
The theme is widely used by many sites, but the good thing for you is that you're not in a webmaster/admin niche, so probably your members don't know and don't care. I'd work on the menu though and change some colours, to match your logo. Otherwise, looking nice. Best of luck with it.