Efficient and refined, L4D is sure to please anyone with a brain.
L4D is a hard game, no doubt about it. In this game only cooperation with your teammates will keep you alive in the gruesome zombie apocalypse. If you try to be a lone wolf you'll most likely get killed by a hunter or smoker (some of the special infected).
With L4D, Valve has trimmed the fat and only left the meaty awesomeness. There are only a few weapons to chose from and a few levels to mess around on, but it all feels incredibly sharp and polished. Similarly, the graphics perform well and are beautiful (as beautiful as zombies barfing and fighting can be) thanks to some tweaks in the Source engine. There are some minor shadow issues, but those are really only an issue if you get up close to them.
But who controls the zombies? That would be the AI director. Every time you play a level he changes stuff up. Weapons won't be in the same spots and corridors once teeming with "infected" will now be silent, ensuring maximum re-playability. Special boss infected are also controlled by the AI director in the campaign mode, but L4D's second mode, Versus lets you go 4 V 4 in a survivor / infected battle where the infected players are tasked with stopping the survivors from getting to the safe house at all costs. Then the roles are switched and the hunters become the hunted.
Overall, L4D is a great game. What it lacks in quantity it more than makes up for in quality. This is one infection that you'll want to catch.
