Exactly what i've thought about L4D games from the start, just running and gunning with no real variety to the gameplay and no real plot or story. Its just mow through a mob of weak zombies, save team mate from special infected attack, fight another swarm, repeat, repeat. No amount of randomizing the order of the encounters changes the fact that, aside from scenery, once youve played through 1 campaign on either L4D game, you've pretty much experienced everything the game has to offer.