I heard MGS 2 was ported on the original X-Box, but didn't sell too well.
Each system has something which makes it better than the other two, so there is no reason to fight over which one is better. If anyone has been to the system wars forum on Gamespot.com, you would know that this "war" is a never ending loop. Wii has innovation in the controller and downloadable nintendo games; PS3 has innovation in bluray, the controller (which I think is too gimicky), and the cell; and the 360 has innovation in the online service, controller (when it first came out), and computer connectivity.
-my 2 cents