Given the actual volume of posts there are waaaaaaaay too many subforums and categories and subforums within subforums within subforums. It'd be smart to condense a lot of it into single forums for things - instead of having a whole bunch of dedicated individual game forums, have a single one. It'll cut down on threads like "Is the two-hundred and seventy-sixth frame of the new trailer for Zelda Wii U cool?" because people won't feel the need to populate an entire subforum with threads about a single, unreleased game, and it'll consolidate a lot of discussion into one place which will make it feel more active which will in turn lead to it being actually more active.
When you have so many subforums where the most recent post might have actually been a week ago, it makes the entire site look turgid and slothful. Cut down. Condense. Streamline.