Well here is a list :
- Unique idea.
- A lot of ingame departments and types (spars, SP, MP, replay making, and the various mods...)
- The community of course, this is one of the most active game forums out there.
- Mods doing their job correctly (not like some other forums).
- All the additional, and yet more active than expected, stuff to do (marketing, texture making...)
I could go on...