SHINE is half right, you haven't played the best MGS game. Peace Walker is not better than 1-4, but it's still pretty good after you get used to it.
But god damn you haven't played MGS3? GET MGS HD RIGHT NOW AND PLAY IT. Best game ever.
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~Halo Give into the Night.
http://i10.photobucket.com/albums/a125/ShadowHalo/haloshadow1.gif