Not great, but good.
Negatives:
-The human enemy A.I. They are flat out the dumbest A.I. I have ever fought in a game. You can "sneak" literally right in front of their face and they will not see you. As long as the light indicator on your wrist watch isn't on, then you are practically invisible. The human enemy A.I. will be standing right under a light, you shoot out the light, and they wont even flinch as if the light gets shot out on a daily basis.
-Other than the human enemies, there are only about 4 or 5 type of other enemies you fight against. A little more variety in enemies would have been nice. The boss fights were nice, but the other enemies died from 2 or 3 shotgun blasts. Nothing to challenging about that. These are the only real legit complaints I can think of about this game tho.
Positives:
-Large variety in guns.
-Lots of customizations for your guns.
-Pretty lengthy shooter
-Decent story. (But not amazing like everyone boasts about)
So bottom line is, if you are hurting to play a shooter, then give this game a try. I personally think there are better shooters out there, but Metro Last Light isn't bad.