I agree that sniper is a very powerful defensive class, but I'd say he's more effective in locations with large sightlines. in a map with small corridors he isn't that effective (Thinking of a map like junction atm)Sniper. No doubt
My bad, it's actually medic. If he has teammates ofc.Demoman
Engineer and heavy. both provide great single point defense, the engineer can lock down a room with his turret at lvl 3 but it can easily be destroyed by a nicely shot pill. same thing with the heavyI would say sniper, but that's because I main him cx