>>370368032
The gun and movement feel is counterstrike, but there are a few other game modes people play besides S&D like Rush and Hidden and PVE zombies, as well as TTT and stuff in custom workshop maps.

>>370368461
I think if you have your ports forwarded, the embedded gmod server will just work. I did try to do the HL2 coop campaign once but the workshop mod for it was buggy, and so was the gmod VR mod, so it wasn't stable enough to be fun.