The GMod 13 server list is organized by gamemode, from most played to least.
The problem here is that new gamemodes will NEVER be stumbled upon.
For example, if I were to make a gamemode that is somewhat similar to Flood, but contains a plethora of different game mechanics such as team-based combat and different weapon/ammo systems. I would be provided with two options. Should I release it under the official name of Flood, but a different ingame alias, which would doom my gamemode to never being truly set apart from Flood, or should I officially call my gamemode something unique, dooming it to sit at the bottom of the mile-long list of gamemode corpses.
The situation sucks. If I release a gamemode the only way of getting a steady flow of new players is to advertise heavily or invite friends. This simply wouldn’t work for obvious reasons.
To fix this, I propose that, by default, the server listing is sorted alphabetically by gamemode. This way, if you were searching for a specific gamemode it would be easy to locate, and if you were searching for a new gamemode to stumble upon, it would be there amid the popular and the unplayed, waiting to be found.
As of now, gamemodes are doomed to being buried in the ass-end of the server list. It won’t be long until new gamemodes are all just single-server mods ran by one person.