Well, in my opinion, this is one of the most debated topics.
3 of the sickest games ive played are Manhunt,Portal 2 and Blood.
Manhunt has very good qualities graphics, and isnt so much 'spooky' , but lets you spook the **** out of other people. Sadly, no multiplayer. But how many games let you strangle someone with a plastic bag and bash the crap out of them ? Or ram a crowbar into someones head and jimmy out their brains ? Its 3rd person style (think Grand Theft Auto style).
Now, portal 2 is FPS. It isnt 'scary', but just disgusting and makes you LOL. Graphics are kinda sad, but still, good for a laugh. I mean, common, how many games let you taser people, urinate on them, douse them in gasoline and throw a match on them?
Or how bout ramming a cat onto the butt of your gun, then shooting the cat off?
Blood is old..VERY old. But it is a legend. Sawed off shotguns, napalms, TNT sticks, zombies, ghosts, and a FPS character with a bad attitude.
"Im gonna paint the town reeeeeed."
"Da-da-dat dats all folks!"
Oh it gets worse.....much.....MUCH worse.....but i wont spoil it. See for yourself.