I played L4D with my friends all turkey day and overall I thought the game was very repetitive (I'm talking about the campaign). I thought the environments and level to detail was spot on, but the choice of weapons (really only the auto shotty or m4), and the small amount of zombie classes (normal, fatty, smoke, hunter, witch) made the game pretty boring
I mean come on, I was expecting to see some different zombies while I progressed through the campaign, but I was disappointed. Fun game to play for about an hour at a time though.