Left 4 Dead

"Forget zombie hordes for a second, put the intricate and sophisticated animation system to one side, and focus on what’s going to make Left 4 Dead special: self-shadowed normal mapping."

"Turtle Rock is still in the process of tweaking bots for single player, so we didn't get to experience AI companions all that much. There are a few rough spots in the game as it stand right now, the most apparent being the ease with which a player can die by falling from a ledge. After each map of the campaign you'll be rewarded with achievements, merits, and demerits, which are handed out for a variety of helpful deeds, like handing out health packs, and poor decisions, such as detonating a Boomer at close proximity to the rest of the Survivors."