When comparing Garry's Mod vs Batman: Arkham Asylum, the Slant community recommends Batman: Arkham Asylum for most people. In the question“What are the best singleplayer games on Steam?” Batman: Arkham Asylum is ranked 75th while Garry's Mod is ranked 112nd. The most important reason people chose Batman: Arkham Asylum is:
Arkham Asylum is the first game to bring us freeflow brawler melee combat in its full glory. It invented the combat genre where you fight a multitude of enemies who take turns attacking you, while the player has a basic attack, a parry+counter and a combat roll. Getting multiple hits in on enemies builds up a combo streak that makes batman stronger. This streak is reset by getting hit by an enemy. Other games, like Assassin's Creed, had superficially similar combat systems, but not as optimized as this and they did not feature hit/combo streaks. Arkham Asylum's freeflow combat system is very suitable to be played with controllers.
Specs
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Pros
Pro The games mechanics and mods allow for ridiculously funny gameplay
You can do some really crazy things in this game thanks to all of the community mods available as well as the built in, in game tools. Pretty much any scenario can play out in the game, if you so desire. Of course the winning combination of funny tends to be when players are just goofing around.
Pro Tons of community made add-ons allows the game to continually grow
Garry's Mod has a wide variety of community made add-ons, which deeply extends the games content and versatility. Pretty much, if you can think of it, someone has probably already made it.
Pro Freeflow combat pioneer
Arkham Asylum is the first game to bring us freeflow brawler melee combat in its full glory. It invented the combat genre where you fight a multitude of enemies who take turns attacking you, while the player has a basic attack, a parry+counter and a combat roll. Getting multiple hits in on enemies builds up a combo streak that makes batman stronger. This streak is reset by getting hit by an enemy. Other games, like Assassin's Creed, had superficially similar combat systems, but not as optimized as this and they did not feature hit/combo streaks. Arkham Asylum's freeflow combat system is very suitable to be played with controllers.
Pro Fun stealth & gadgets
Remaining stealthy and getting stealth takedowns is important in Arkham Asylum's gameplay. Arkham Asylum gives the player a relatively large number of different gadgets to use for different combat purposes, such as ranged takedowns, cutting ropes, diverting enemies' attention, blasting through doors, traversing longer distances and hacking.
Cons
Con It has nothing to tell as a campaign. Tastes like void, that is "meh".
Con Previously free to download
Garry's Mod used to be a free download but it is now a paid game on the Steam store.
Con Tons of bugs
At least in earlier versions.
Con Dark atmosphere
You won't realize how many shades of black exist until you've played an Arkham game. It's always dark outside, so to people who like daylight and colors in their games, this might get a bit dull after a while.