I really like this idea! For the case that it stays at round Avatars that is.With the circular avatars a coat of arms rank system would fit im my opinion:
(Not the best job to be honest, but hopefully you get the idea)
Beside that, the report button is dominant on the left side. I read it every time, and it gets annoying. Back to the right side please.
The background could look better, with some form of variety. The Home-page has rain or something in the background, while the steam forum uses one of the excellent artworks.
Also, why is there no link to the home page in the forums tabs?