Left 4 dead 2 is packed with new stuff, and it's a lot more fun.
I absolutly loved the first Left 4 dead. So much in fact, that I had no problem with valve releasing a sequel only 1 year later.
And for those of you out there that think that this should have been an expansion pack, let me tell you that this game has WAY to many things in it, for it to fit in a single download. First off there's the 5 new campaigns, each with 4 to 5 missons a piece, and all of them are fun to play. Replaying these campaigns however is a differen't story, since only two of them " Dark Carnival" and " Hard Rain" are actually fun to play multiple times. It's not that the others are bad, it's just that those two really do something awesome. For Example, Hard Rains constant storms create moments of tension and sometimes, flat out moments of horror. But there is more then one way to play the game, in fact, there are 4 differen't ways to play L4D2. There's the VS. mode from the first game, Survival from the free DLC pack and the all new mode, Salvage, which is by far L4D2s best mode. You'll play up to 5 rounds, easch with a timer of a minute and a half, the goal is to find gas cans that are in the buildings around a generator. The team with the most gas cans wins, you will also switch sides every round, you'll be either the Survivor or the Infected. What makes this mode so fun is the constant threat of special infected, and the need to work together as a team to win. Unlike VS which has sadly fallen to the team killing, ammo wasting, witch waking side of the L4D community. But all things considered the amount of variety in L4D2 is much better then the first. The last 2 things this game adds are the new Survivors and Melee weapons. The new crew may not be as good as the first, but they are still fun to listen to, with coach and ellis being the only stand-outs. The melee weapons however are all great, they add a suprising amount of tactical consideration to the already tactical gameplay of L4D. Since they don't break and do a massive amount of damage, you'll most likely choose to use a melee weapon over the standard pistols. They also show off the amount of gore on display in L4D2, which seems to have gone up since the first.
Overall: This game is awesome, there's just so much good old-fashioned zombie killing, that it's easy to overlook some of the problems that are present. P.S to all those team killers.. STOP IT.