When comparing Alien Swarm vs Left 4 Dead 2, the Slant community recommends Left 4 Dead 2 for most people. In the question“What are the best LAN party PC games?” Left 4 Dead 2 is ranked 3rd while Alien Swarm is ranked 29th. The most important reason people chose Left 4 Dead 2 is:
Left 4 Dead 2 features a co-op versus mode that pits two teams against one another. One takes on the role of survivors, which is very similar to the normal campaign. The other team, however, plays as the infected, opening up a whole new play style and set of strategies.
Specs
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Pros
Pro Easy to pick up and play, even for beginners
The game consists of tried-and-true top-down shooter mechanics that will be familiar to most players; it is reminiscent of older arcade and console shooters.
Pro Anyone can download and play the game as it is free-to-play and open-source
The game is completely free and has no microtransactions or ads.
The source code is also free and accessible, so the game can be easily modded.
Pro Easily play with up to 4-players in online co-op
Alien Swarm allows for up to 4-player online co-op, which makes for an easy way to play with a small group of friends or strangers.
Pro Convenient offline LAN support
Alien Swarm offers offline LAN (local area network) support, meaning that the game can be easily played locally with each machine connected together in the same place.
Pro Turn the gameplay upside down by hunting the hunters in a unique co-op mode where you play as the zombies
Left 4 Dead 2 features a co-op versus mode that pits two teams against one another. One takes on the role of survivors, which is very similar to the normal campaign. The other team, however, plays as the infected, opening up a whole new play style and set of strategies.
Pro Invigorating cooperation based survival dynamic
Left 4 Dead 2 requires players on the same team to cooperate to survive. This makes for an interesting dynamic for teammates, as it will be increasingly difficult to make it through a level if any one player decides to go off on their own.
Pro Highly improved over Left 4 Dead
Those who loved the original Left 4 Dead will find this game even more enjoyable. Almost everything has been improved, including the AI. Other additions to the game include new enemies and melee weapons.
Pro AI teammates work great in single player gameplay
For those that prefer to play with AI, this is one of the best co-op games for offline bot play.
Pro Low Spec
This game can practically run on a potato.
Pro Melee weapons have the best visceral experience
Left 4 Dead 2 includes melee weapons for the player to use during the game. These allow for not only more graphic violence, but also a more personal and visceral experience.
Cons
Con Can get a bit repetitive
The gameplay doesn't change much from mission to mission; you’re generally just shooting aliens over and over again.
Con Gameplay is too short
The main story only takes about three or four hours to complete, which means you could beat the game in one sitting pretty easily.
Con Very difficult without team engagement
For those looking for a casual co-op experience, Left 4 Dead 2 probably isn't the best option. Without a good sense of teamwork and focus, this game can get very challenging.
Con AI not the smartest
The AI has a tendency to make ridiculous choices that can screw up what players are doing. This can become a big problem when relying on AI teammates in order to get through a level.
Con There is no variation of gameplay
Making it very boring after a few hours of playing. Slaying zombies is fun and all, but it gets exceptionally dull once the "wow" effect of blowing zombie's brains out wears off.
Con More of the same
While the game has been improved compared to the original, there are no wildly different game mechanics. If you did not have much fun with Left 4 Dead, you will probably not get much enjoyment out of the sequel. Some have gone so far as to complain that it feels like a large DLC update rather than a discrete game.