Underrated Gamemodes

HL2RP is one that comes to mind.

It is a text only character based rp server. A lot of the time on the server you will spend talking to other players and developing your character. But when push comes to shove, the combat can be very entertaining and even suspenseful. On most servers, a lot of the combat takes place in turn based /me's between characters, but other times you can be shot on sight. This gamemode is not for people who like constant action and the general toxicity of modern gmod servers, it is for people who like ACTUAL RP. You spend time simply developing your character and getting your name known.