Well I am not sure what exactly your after here.
Basically you would post a product review or something and members may make reviews or posts about it etc
I have on my site as an example athough members are not allowed to comment here a marine identification database http://www.reeftalk.com/reviews/show...oduct=81&cat=8
You can alter things to your liking in the program. The language phrases the templates the look and feel the sky is the limit depending on your ability.