MGS2 is my favorite and the first I played. I really wasn't expecting such a thrilling and awe inspiring game. I couldn't turn it off and the plot twists at the end were cool. I didn't mind playing as Raiden because I didn't know anything of Snake. MGS3 was very good as well. Never played MGS 1 for ps1. I bought MGS4 but haven't gotten around to finishing it. Not sure why, the overall feel for the game and less need for stealth maybe? I'm sure I'll finish it one of these days.