Really tough question.
The closest game which i can call a "perfect game for me" is
Postal 2. Definetely. A great combination of an intense FPS/gore and humor. But its not the best game i played, to tell the truth, i got pretty sick of it now. When i firts discovered it, i played it day and night. Now, i dont play it at all. But i work in the editor and create new maps - and thats one of the reasons why Postal 2 is so cool - the free unreal editor. Unreal is great because if you have the skill - you can create ENYTHING!
I really dont know whats the best game i played...
Maybe
Call of Duty 1. A legend! An icon! A gamer cult! Fuck all the new CODs, the first one was the best! I was there, when it first came out - i played it online in the time when there was only one COD, and my god, i never had this sweet feeling of love. Those were the best times i had in a multiplayer game. The multiplayer was simple, but badass. Amazing inovative game.
Max Payne. If you dont find this game spectacular - than die!
GTA: Vice City. The best of the GTA series (atleast for me). A masterpiece like this will never be done again. I really doubt that GTA 4 will be better than VC. A great story line which doesnt go to such rediculous extremes like SA, badass main character, nice weapons, cool cities (islands) and a shitload of cars, how can you go wrong? But the most inovative GTA series was with no doubt - GTA 3 - simply by bringing a 2D game in a thrid person shooter, AMAZING.
Manhunt - go find somebody and mercilessly kill him. A perfect display of sheer brutal violence. Great game and i have my reasons for it, nuff said.
Doom/Doom 2 - Its still one of the best FPS in the world for me. Doom is the whole definition of FPS, it has its age now, but it will never lose its power!!!! And you new wanabee gamers should play some old school cult games, before you start bitching how good you are in Halo (or whatever is that shit called).
S.T.A.L.K.E.R. - Shadow Of Chernoby - Amazing game. I just picked it up lately and i am like "WOW". The athmosphere of the game is just spectacular, i really cant describe how amazing it is. You can actually feel the place. The FPS mixed with RPG is really awesome too, its original and functional. Not many games have this awesome athmosphere and it kicks serious ass! I really dont know how to explain the whole awesomness of this game lol! I want to go to Chernobyl on a holliday!!!!!!!
Counter Strike - Eh, CS has some weird magic, that causes players to like it
.
And i can go on and on and on with this list, but im getting the feeling that im writing a book here, heheheh.
And one more thing - games are one of the best things in life, people who say that they are mindless and pointless time wasters are wrong. Im not gonna lie here, i spend more of my time playing games - i like them and i can relax while playing them. Its a ecape to a world where the shit around you doesnt bug you. I have the urges to kill people in real life - but i dont - i control myself - but i can do that in a game. Whats better than pointing the shiny end of a shotgun at your enemy, pulling the trigger and watching his brains splatter at the wall behind him?! I pretend that those are the people i hate and i just let the anger fly. Games are great, end of story.
Here is a list of some other awesome games that need mentioning:
Condemned: Criminal Origins
Americas Army
Medal of Honor : Allied Assault
Fallout
Serious Sam
Tetris
Crysis
The Hitman series
Mafia
Flatout 2
Vietcong
Driver
Oblivion
and the list goes on......
So I never LOVE Vice City, previous and next parts are - for me - better. 
