To be fair Civvie kind of bitches about hitscanners on occasion, but really only when the game/level designer pulls serious shenanigans with the placement of hitscan enemies. (Shadow Warrior has some really nasty/annoying spots with hitscanner traps, and one or two really nasty UV Doom 2 levels where the Chaingunners will just fuck you right up if you're not really careful)
Shit like the Vivisector game with flaming cheeta's spawning out of thin air and gorilla's with mortar's hitting you before you can even see them. That seems more than valid to complain about. And he was playing Shadow Warrior on the hardest difficulty. Chaingunners in Doom are just acknowledged asshole enemies.