When comparing Arma 3 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 Arma 3 is ranked 47th. 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 Best in class authenticity
ARMA 3 is built as a simulation-type game and features rather tactical gameplay with a slow pace. The developers use real-life military weapons, equipment and vehicles. Even some of the environments in the game are virtually indistinguishable from their real-life counterpart. ARMA 3's gameplay also encompasses more than a regular first person shooter, as military tactics such as water attacks, giving orders to squadmates and drone strikes are necessary in order to successfully complete a mission. Elements such as destruction are extremely important, as certain specific parts of a vehicle can be damaged.
Pro Huge open maps
As ARMA 3 is an open-world experience, singleplayer missions are not as linear and take place in the same map area as the game's multiplayer mode. There are a couple of different islands to explore in ARMA 3, including Altis which has a size of over 100 square miles (270 km²). Stratis is the smallest island in ARMA but is still respectable in size but 7.7 square miles (20 km²). A new map - Tanoa - is scheduled to be included in the paid Apex Expansion pack, with a size of 38.6 square miles (100 km²).
Pro Huge amount of mods and add-ons available
The modding community of ARMA 3 is quite large, with multiple online communities and free tools provided by Bohemia - the developers of ARMA 3. At the time of writing, there are 115 mods available on ModDB and over 23500 mods in the Steam Workshop.
Pro Steam workshop
So much content on the Steam workshop. You can get 200 GBs of mods in 2 days.
Pro No player limit in multiplayer games
ARMA 3 doesn't impose restrictions on its servers, allowing for a true sandbox experience with a large population. Battles can be fought with hundreds or even thousands of players; multiplayer warfare is definitely large-scale.
Pro Long single-player campaign
The average playtime for the single-player campaign (referred to as 'Main Story) of ARMA 3 clocks in at just under 20 hours, while a 100% complete playthough of the campaign averages 39 hours of playtime.
Pro Underwater gameplay
ARMA 3 features underwater gameplay with diving gear and underwater weapons. Underwater gameplay is noticeably different, because it uses a third movement axis.
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 Controls are unique and can be a barrier
It's not as simple as ctrl for crouch. While many tactical shooters use a similar s=control scheme, ARMA takes a sharp departure from the norm. This is part of what enables it to have far more robust/tactical movement.
Con Steep learning curve
The tactical aspect of ARMA 3 is also portrayed in the somewhat difficult controls and steep learning curve of the game. For example, a lot of different buttons and keystrokes have to be remembered for all the different commands, equipment options and vehicle controls. There is no in-game tutorial, the only way to learn how the game works in by trial and error, a field guide or by using in-game hints. Tactical elements and strategies aren't explained in the game.
Con Framerate isn't consistent
ARMA suffers from some framerate issues, with very variable results in both single- and multiplayer situations. Often the game will perform well in multiplayer, while dropping down to a severely worse framerate in a single player mission. Similar problems occur vice versa as well, which results in a very inconsistent framerate.
Con Hard to set up missions
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.