Definitely one of the most incredible game experiences of the last generation.
I've bought it on three separate occasions: snake eater, subsistence (the proper version to play) and again with the MGS collection version.
I still enjoy watching the cut scenes in theater mode in addition to replaying various favorite sections of the game.
Odd thing is it took a second look at the game (subsistence) before the game really grew on me. The fixed camera angles of snake eater were a bit of a game breaker for me and all I wanted to do was skip ahead to the next story cut scene.