Tips? Okay, natural Class prey and predator
Scout- Predators: pyros and natasha. Prey: snipers, and pretty much everyone you can get close too.
Soldier: Predators: Sniper, spy, flamethrower(airblast). Prey: engineers and sentrys, and other prone players.
Pyros:The easiest player to play. Predator is scout, prey is everybody.
Demoman: idk D:, engys i guess
Heavy: Prey: everyone close enough to you. Predators: spy, sniper,
Engineer: Prey: everybody except spy. Predator: spy
Sniper: Prey: heavies, soldiers, stand-still engines, other snipers. Predator: Spy's or anybody that can get close to you.
Spy: nuff said. (stay away from trigger happy pyros)
Medic is not included >:C
and no i'm not saying that heavies cant kill snipers. Its likely. But its just easier for a sniper to kill a heavy at long distance