Metro 2033 is equal parts masterpiece and blunder.
The guy who wrote the novel obviously had the best intentions for the game adaption but likely didn't understand gaming so well. For everything the game does right, theres a blaring issue that holds it back from greatness. Though, it does do a lot very well!
For instance, the immersion is great, what with the almost HUD-less screen and the interactions between your watch, charger, mask and unique guns (like compressed-air spike launchers that require manual pumping) but then there's unforgivably antiquated stealth segments, and gunning through them will actually hurt your ending in the long run, yet you're never told that there's multiple endings or a karma system at any point :/
So, yes, get it, but be prepared to forgive it it's flaws first.
Pretty much hit the nail on the head, here... It creeps you out, because you're constantly manually charging your flashlight, just to see the monsters that are trying to claw your eyes out.
On the other hand, if you have half a brain and converse ammo, then you're probably gonna go John Rambo by the end of the game, and all of the difficult parts, like the Librarians, suddenly become easily-to-kill enemies with a few scenes of OHSHIT! between pumping them full of mil-grade bullets... >_____>
But the first half of the game is amazingly scary, because you're trying to scavenge ammo outside, and you're running out of air, plus when monsters hit you, they can crack your gas mask, and even break it.
Although I personally got kinda peeved at the way Nazi soldiers can carrying two gasmasks, yet Artyom never has the brains to strap second to his hip, in case a nosalis cracks his first one while he WTFKNIFEZ! it in the face... >________>
As a scary game, it does it's job, but as a fun game, it kinda dies halfway through. (for me, at least)
Buy it while it's on sale on Steam or something, if your computer can handle it. Otherwise it's not worth paying full price for it...
PS: I just borrowed Stalker: Clear Sky from my buddy Ethan. While I haven't played any of them before, I'm gonna start on it after I finish Alan Wake (Which has a weapon scheme that I won't even begin to RAAAAAGE about right now, because this post is long enough.)