The best feeling in a game

The first time I played Stalker. It was about a year and a half ago when i still had a shitty Ati Radeon 9550, not that my current video card isn't shitty.. but oh well.
Anyway, i waited for a while for the game to get loaded, i loved the intro and as soon as i entered the game i knew it would be something special. I loved the music at the trader's and I quickly rushed things to get outside. I had no idea what kind of world was expecting me. It was morning(ingame) and there was a wonderful atmosphere. I talked to some of the NPCs which were so lifelike, they were also talking to each other and then, one of them took out a guitar out of his ... pocket :), not that it bothered me one bit, and started playing. He had some nice riffs actually.
Anyway, as i went on with the game it seemed to change, it wasn't just a regular shooter. I discovered you could have loads of items, the atmosphere became much darker and the graphics were fantastic. I payed no mind to the gameplay and AI flaws as they faded away into the background because of how intrigued i was with this game.

I think it's been one of the best gaming experiences ever. I'm still playing the game today and I'm enjoying it to the fullest.