Others have mentioned it, but Kane and Lynch 2 also explores the concept of violence in video-games being horrific and the player being at fault [similar to Spec Op's] in a subtle manner [arguably too subtle].
Here's an article that briefly explores the subject.
OH GOD MY EYES AWFUL LOOKING BACKGROUND AND TEXT!
See, unlike Far Cry 3 where the writer didn't convey any of that in the game, K&L does all of that. There's no good ending in the first game, and I thought it was a great story ending in K&L 2 (maybe not great for gameplay but then this isn't like some hollywood movie with the biggest bad as some boss challenge) with the dogs and getting on the plane with no fanfare. Your job is done, you've escaped, what more do you want?
Them sipping drinks on a beach watching some news report about their success walking off into the sunset like Max Payne 3?
The headshot, usually the most satisfying part in typical shooters, has been denied from you. No, you don't get to see the immediate dopaminergic reward of your brilliant aiming, you just get a censor bar and see the consequences of a pool of blood spilling over the floor. When you shoot a person dead, they don't fly back in a great feedback manner, they just slump over. Look at all this violence you have caused. It's disturbing, realistic, creepy. Might not make for the most rewarding shooter ever, but it was consistent with the atmosphere and world they created.
For some critics and K&L fans (yes, we exist!), we got the message. This was a straight shooter, no palette cleanser turret sections, sniping bits, or driving segments like the first game. This wasn't a heist adventure like Heat in the first game, this was like the midnight amoral blur of Collateral. They were more confident with the second game on those fronts of being unconventional while still improving some of the gameplay, even if that went in the face of rewarding players for every thing they did.
Still, my one big complaint about K&L 2 was I wanted more character development. A little more flavor text between Kane and Lynch that wasn't related to business. What they're planning to do with the money, their thoughts, why Lynch doesn't hallucinate as much anymore because the whole trek is over days and he never takes his meds.
I really should check out
Hotline Miami, since it's going for the same unsettling atmosphere and ultraviolence.