Just some quick first thoughts:
-Nice theme. It makes it harder to immediately discern that you're using SMF.
-Can't immediately tell what the purpose of your forum is. I see references to "reviews" and such when I first land on the page, but reviews of what? You need some sort of tagline or other way to make it clear what your forum is about and who the intended audience is.
-Problem #1: Using SMF. It's not very robust and has a very "ancient" feel to it. Although nowhere near as horrendous as phpBB, it's not as good as say, MyBB in my personal opinion. Obviously if you wanted to go big you'd use IP.Board or XenForo (which is quite refreshing, actually). Normally I'd recommend vBulletin but IB has run it to crap in the past few years.
-The general category at the top (Intros, reviews, etc.) should be further down the homepage, with more content-relevant categories before the fold of the page (i.e. seen before having to scroll down).
-You have way too many categories and forums for a brand new forum; it prolongs the appearance of emptiness, and you should start small and really only expand as you need to.
I know this is probably a shameless plug but if you want some more advice from other forum admins, check out the admin community I just sold a few weeks ago,
www.adminaddict.net.