Instead of complaining, might you post an interesting topic yourself?
Also, as Amity said, it isn't our job to make the forums worth your own while. People have diffing opinions on what they define as 'interesting.' A lot of the decent, informative topics actually get lost within the forums.
Other than that, I have noticed people making a conscious effort to post informative posts. Maybe you should dig a little deeper instead of just skimming the forums.
I also completely agree with Amity's last post. When a fresh, interesting topic arises, a lot of the members here do not have enough knowledge on that subject to strike up a heated discussion.