When comparing Portal 2 vs Left 4 Dead 2, the Slant community recommends Portal 2 for most people. In the question“What are the best multiplayer games on Steam?” Portal 2 is ranked 7th while Left 4 Dead 2 is ranked 11th. The most important reason people chose Portal 2 is:
While Portal 2 requires focus and logic, it does not punish players for causing a bit of mischief. The instant respawn system means trolling your friend will affect almost nothing in the game, as there are no in-game setbacks when you die. Being able to stop at any point in the game to just goof around is great for releasing some steam, even when it is at the expense of your co-op partner.
Specs
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Pros
Pro Co-op does not punish when you want to goof off with or troll the other player
While Portal 2 requires focus and logic, it does not punish players for causing a bit of mischief. The instant respawn system means trolling your friend will affect almost nothing in the game, as there are no in-game setbacks when you die. Being able to stop at any point in the game to just goof around is great for releasing some steam, even when it is at the expense of your co-op partner.
Pro Huge selection of user-generated content that should appeal to any use-case
The game has more than 60,000 co-op puzzles created by users through the Steam Workshop and through mods. Because it is user-generated content, the quality and size of these puzzles vary widely, including everything from simple, one-off chambers to full-fledged expansions with high-quality stories, voice-overs, and new gameplay elements (for example, Mel). By having such a selection of content, there should be something that appeals to just about anything someone is looking for.
Pro Entertaining and well delivered voice acting
Voice acting for Wheatley the AI robot is done by Stephen Merchant (Extras, The Office UK, Life's Too Short) in humorous fashion. His delivery is well executed on all dialogue. On top of this specific experience, the rest of the voice acting of every other character in the game is performed just as well, in part due to the fact that the dialogue was written in a funny smart and entertaining cool fashion. This makes for a top quality listening experience that shows a lot of care was taken with the acting of the game.
Pro Creates a sense of accomplishment through a high level of teamwork
Game is shit
Pro Challenging puzzles that require creative thinking
Pro Witty and funny character driven story
Four major characters drive the single player poop campaign, and they are amazing. Three of which have explosive personalities, bring humor, suspense, sadness, and empathy. The other being Chell, who doesn’t speak but her interactions with the rest of the cast make her all the more mysterious and interesting. Most of the time you don’t even see or directly interact with the characters, but that just shows how great and cool they are.
Pro Cross-platform co-op
As long as both players have a Steam account, the co-op is able to be played even if one user is playing on the PS3 while the other is on a PC.
Pro Well implemented tools that improve teamwork
Pro So large in scope that it takes multiple playthroughs to see everything
Portal 2 is larger in every way when compared to the first title, from the longer and more detailed story to the larger levels and new game mechanics. This makes for a title that will last 8-9 hours minimum, with many elements that are worth revisiting, not to mention the co-op section of the game, which is separate from the single player story.
Pro Versatile selection of co-op multiplayer
It’s possible to play a multiplayer game for free online using the Steam servers, as well as locally on your machine using split-screen (the second player must use a gamepad controller if playing locally). This keeps the multiplayer options versatile to any players needs.
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 Main co-op campaign is short
The co-op campaign in Portal 2 is about 4 hours long for experienced players, meaning it could be beaten in a just a couple days. With almost zero replayability, this makes the game feel incredibly short. Luckily, hundreds of hours of user-generated content is available.
Con It's already on every coop list since 2011
Con Steep co-op learning curve
Although the single-player campaign features a gradual learning curve, co-op offers no mercy. The puzzles start off hard and only get harder. It’s highly recommended that you play through single-player first if you are not familiar with Portal's mechanics.
Con Sense of accomplishment is often onesided
Con Frequent motion sickness trigger
Con Late game single player can be quite difficult
While the single player learning curve is quite gradual, late game the puzzles can become quite difficult, sometimes leading to the player being stuck for long stretches of time. While not impossible to solve, some creative thinking will need to be done in order to finish.
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.