Left 4 Dead is Ridiculously Fun!
Leave it to Valve to create a game with no story, no character development, virtually no single player experience, but it's averaging close to 90%. There isn't much to Left 4 Dead, but that's part of what makes it so great! If you've played a shooter before, you can jump right in and start blasting zombies while only a handful of hints will pop-up to make sure you're on track. It's simple nature makes it extremely accessible, and the 4 player online co-op couldn't be more fun!