When comparing Metro: Last Light vs Garry's Mod, the Slant community recommends Metro: Last Light for most people. In the question“What are the best singleplayer games on Steam?” Metro: Last Light is ranked 3rd while Garry's Mod is ranked 112nd. The most important reason people chose Metro: Last Light is:
Metro: Last Light was the first AA game released on Steam that was not a Valve title.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro The first proper AAA game on Linux that was not a Valve title
Metro: Last Light was the first AA game released on Steam that was not a Valve title.
Pro Alternating gameplay
From mission to mission the game will alternate from action to slow and methodical, creating a nice pace for the player.
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.
Cons
Con You'll have to get the DLC if you expect to get more than 8 hours of gameplay out of it
There is only about 8 hours of gameplay in the base game.
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.