The game features plenty of shadow-flickering and problems with the lighting. Hooray!
http://www.youtube.com/watch?v=uMTJp_p2NLQ
This game is unplayable for me until they fix it.
I'm getting this problem too. The game also is generally running poorly. Some textures drastically kill performance. I'll be looking at a wall getting 60, then turn to look at door and it drops to 17.
The fog effect also looked awful, there was just like a patch of it on the ground that's motion was very jittery.
Tesselation, even on normal, also hurt performance significantly. It's too bad you can't change individual options - just High, Very High, etc...I'm trying on High, no AA, no physx, no tesselation, as I played Metro 2033 on Very High DX11 but it's not very playable.
Could do that config change to DX9 but rather not...
Also find it odd it's not even using 1GB of VRAM but still running so badly
EDIT: Found this article:
http://www.gamefront.com/metro-last-light-performance-tweaking-guide/
using the settings it recommended: Very High, Tesselation Normal, 1080p, Motion Blur Normal, SSAO off, and AF 16x it now actually runs much better and looks much better. There are still occasionally lighting glitches but they are quite minor compared to before. Strange thing was I ran the benchmark that came with the game and on the same settings as before it ran fine...not sure what's up with that. Anyway, got it working pretty well and now the games much more enjoyable. So if you're having similar issues try changing settings - even upping them.