I believe that this was already suggested, so I will just put my arguments:
Pros:
Cons:
If Skial Garry's mod servers can't happen, then it would be nice to have a forum section/other games subsection.
Pros:
- It seems that Garry's mod is currently popular, probably thanks to gaming YouTube channels
- Although it isn't F2P, it is cheaper than CS:GO and such
- Like TF2 it has many community gamemodes, which are probably more popular than the game itself
- It is easier to customize code than TF2
- Custom addons that require client-side modifications can be organized into a workshop collection
- Garry's mod can mount some Source games from player's Steam library for content and maps
- There aren't issues like fast respawn, trading spam, class limitations...
- It doesn't have any kind of Steam inventory
- Updates are usually smaller than on other games
- You can set up a loading screen
- It isn't developed by Valve or any large company
- Standard gamemode doesn't have a goal
Cons:
- There aren't any quickplay systems
- It seems that there is no way to get an advert MOTD
- There a lot of gamemodes
If Skial Garry's mod servers can't happen, then it would be nice to have a forum section/other games subsection.