I really can't see why people like 2 over 1. The first Metal Gear Solid is one of the darkest games in the series. For example, the scene where Snake reaches the surface at the beginning of the game and sees the Hind D take off. The way the music composes, the angles of the flight, and the graphical effects (blurring and such) really gave the game a serious, gritty and moody tone. The bad guys are also far more atmospheric and believable.
Now you guys think the cartoony orange rig with what is considered one of the poorest character changes (Raiden) in gaming history, and over the top bad guys such as fat bombermen, vampires and such constitutes as a better game? No way. Music, storyline, topics and characters covered in the second game pales considerably when compared to the original game.
Going off on a tangent here, Bungie obviously thought the same as everyone else, and followed the same formula that Kojima did: make a rubbish sequel with far less serious overtones and a ridiculous character change. Halo 2 and Metal Gear Solid 2 has a lot of remarkable similairities really.