I own this game on Steam.
Metro 2033 is a great game, set in russia after Moscu was nuked. In a way this game is a resource mannagement game mix with a linear FPS and a heavy atmosphere. You will never get lost in this game since is all in a linear path unless you scatter your resouces, you have to mannage your equipment, lights, bullets, guns, masks, health, etc. It is quite hard the first time you play, so don't get frustated and just play carefully. This game also has stealth so if you are low on resources you could simply sneak through the enemy base and get to the next part of the level very easly if you know the route.
Gunplay feels right for the type of game this is, it isn't Doom fast, but is not a drag to shoot either, it's kinda slow really, reloading guns can be a chore in the middle of a fight. You can carry up to 3 guns, choose wisely.
The game holds up amazing after all these years (a decade old game!) Visuals look visceral, the ambience strike with decadence, Moscu looks awesome and the music is also top notch, enemies look menacing specially the library monster, wish you luck there.
In short this game is amazing, buy it if you like old school shooters and if you don't buy it as well, it is good time.
WARNING: I don't know it was just me but there was one time the games deleted progress out of nowhere, i'm talking about a whole chapter! I was playing the game as normal as i sudden receive a message: "Game Paused" or something like that, in the chapter were you have to fight the Nazis. It deletes all the progress you done in that chapter, and the only way to solve it is to restart the chapter, be carefull with that.