Resident Evil: Operation Raccoon City comes to mind. I was so enthusiastically waiting for this game that I decided to ignore all the bad things everyone said about it (I was patiently waiting for it to come out on PC a couple months later than consoles). It turned out to be such an awful port to an already poorly made game with heaps of DLC that the only way I could get through it was in Coop. After I finished it once I never touched it again.
Needless to say that I have now taken a more watchful approach to Capcom's games.
If you haven't already played it yet I recommend Stalker: Shadow of Chernobyl and the sequel Call of Pripyat. Both have a unique atmosphere to them and intriguing game-play in terms of a open world to explore and interact in as well as realistic gunplay.
Metro 2033 is also great fun too, albeit a heavily linear experience.
I almost rarely eat any snacks while playing games but I do guzzle down massive amounts of liquid when I play, almost...unconsciously. It's mostly soda or juice, but I find myself rarely being able to play any game without that lingering thirst feeling taunting me.