Right, so you were actually looking to check out the forum. You were doing this after a good first impression. You were not visiting the page just to head straight for the forum, right?
As I understand it, the problem is that only few people are impressed in the first five or so seconds they spend on the website. Let me give two examples. Notice how all the nice looking stuff (including features and artwork) is at the top, visible without scrolling.
http://www.planetside2.com/http://www.firefallthegame.com/To me these sites look EXTREMELY similar and simple:
* Nav and Logo at the top, similar to ZK, but take up less space so less scrolling. Login in corner where it doesn't take up all the space.
* Next comes a nice picture left (where in ZK they all need scrolling), play button at the right, with link to video right below for people who are not convinced yet.
* Then top 3 things you wanna show (could be features, a link to media, etc.).
This is what people will see without scrolling.
Now that people are impressed and want to see more, they explore the website and see the game is actually being played (stats), that the community is active (forum) and even competitive (top 10). We could also link to commentated replays here.