MGS3 is a good game but it gets old once you figure out the levels, because "that's it". Also the boss fights for the most part are pathetically easy. Also the control over Snake isn't that great. There was some low points but they are few and far between. The caves had to be the worst and one of the ugliest levels in the game, many of the later game levels are really ugly and colorless, even the base at the end of the game.
Also the control over snake in third person makes it impossible to aim accurately and being unable to move in first person mode sucks hardcore. How you can say MGS3 is the best game you ever played is stupid, there are far better games out there.