Left 4 Dead is brought to you by VALVE; one of my personal favorite production company's for the simple reason that they don't mind experimenting with their games! Portal is a very good example...anyway back to Left 4 Dead. Left 4 Dead is a zombie survival game in which a group of four survivors have to get to a checkpoint to escape the infected zone.
Story -- 5/10
The story isn't really there, they don't really say how the infection happened, who each survivor is or any other basic info. However don't let this get you down, the purpose of this game is to entertain in its simplest way, through fun. With many different environments and 4 unique characters that will make you laugh with comments throughout the game it entertains though laughs and guts.
Game Play -- 6/10
The classic layout, full free movement in first person. Practically every thing is climbable, breakable and flammable.
Graphics -- 7/10
Good enough, great lighting and very realistic environments.
Online -- 9.5/10
The Online is one of the most awesome features for one simple reason; YOU CAN BE A ZOMBIE. It has the classic Team Vs Team in which the zombies have to stop the humans from finishing the level and the humans have to try and finish. Also if you Download it you can play a survival type game in which you have to survive an endless amount of zombies for as long as possible.
You may have noticed I haven't written much on the above categories, but remember Valve is great for its cutting edge features.
Here is a small list of things that just make the game so brilliant:
Amazing Zombie AI
Big Boss Zombie's
The Chance to be a Zombie
The fact the zombie AI can actually HEAR noise
Funny Comments from the Characters
Multiple ways through each level
Commentary (Like movie commentary but for games, at certain parts you can listen to some interesting comments from the people who made the game) and there are many more.
The great thing about this game is that anyone can play it, and it doesn't will you to keep playing it at all. Which is the odd thing, most games have some aspect that will try and make people replay it, a ranking system or some other kind of cheats to unlock. This game offers nothing like that, yet if you ask any one who owns the game if they have played it more than at least 30 times they will probably say they've played it more. This is how you know you've found a king of a game; when nothing makes you keep playing but you still cant stop.
I hope this helped =)