Please if you read Morkulvs review there are some considerations to consider as I feel he went into the game thinking it was something it wasn't and never was.
Firstly anyone who comes into a game that is mostly about post nuclear survivors scratching a living in the old tunnels of the Moscow underground Metro and expects an open world game clearly is missing a large point. While the game isn't a horror game it can rack the tension up by the atmosphere which is done well and it does look great, even though it is now 3 years old it still looks better than a lot of games that are larger in size, sometimes double the size
Some more points by Morkulv I'd like to counter are firstly the point he made about it not being clear where to go. You have a journal with a compass you can pull out at anytime that should, unless you really are someone who needs your hand holding throughout games, point you in the right direction. Yes there is invisible walls and the like but it's purely to keep the narration flowing. You CAN explore as the in-game money is pre war ammo and is littered about the game world for you to find and while it's no Just Cause 2 or GTA it's not marketed as an open world and as I said earlier, how open are underground tunnels
The use of QTE's actually make sense in the last level as they convey the struggle to get to where you are going and I can't think of anything that would have done such a good job.
Apart from a couple, one where I got a stuck on top of some crate and another where I got too far ahead of an NPC who then wouldn't move I doubt it has the number of glitches the other guy claimed.
All in all it's a solid shooter with good atmosphere, a decent story,rare for an FPS,and has really good gun play. Its not a mindless, follow NPC, Shoot here, shoot there, press E to win shooter like a CoD or the vastly overrated BF3, It's a shooter than has a modicum of intelligence. I gave it 8 but it is an 8.5 for me.