What are people’s recommendation for their favourite FPS single player campaigns that you still enjoy playing a couple of levels once in awhile? No multiplayer suggestions.
My all time one is Medal Of Honor 2010 reboot. I don’t play through it every time but I have a couple of favourite levels.
GZdoom, Brutal Doom, FreeDoom (all packaged for the basis of a single game) then… something to pick there and play: https://www.doomworld.com/10years/bestwads/
The online favourite in Zandronum (multiplayer ZDoom) was Alien Vendetta, an awesome Doom2 campaign WAD. (av.wad or av20.wad) It’s just super solid with lots of variety and good pacing. Made by a bunch of different mappers.