You bought the worst one in my opinion, it's still a good game (great gameplay and music) just way too bizarre even for Metal Gear standards, also, Raiden's not quite as good as Solid Snake.
The entire series is great, mind you I still have to play Snake Eater and Guns of Patriots. I wont say it revolutionized the entire stealth genre, but it certainly made it a lot more popular. Each game has something unique to it, I like the fact that it can make you both cry and laugh your ass off.
My favorite by far is Metal Gear Solid on PSOne, brilliant game with great characters and story, even better gameplay, battle with Psycho Mantis has to be the best boss battle ever. Peace Walker would be my close second, it's much more than polished version of Portable Ops, best portable experience I ever had.
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