N64, with GameCube and Dreamcast as a distant 2nd and 3rd. N64 had some amazing 4 player mutiplayer titles while GC and DC just were underrated in general with some really solid single and multiplayer games.
I don't really consider 360 much of a loser as it was nearly even with PS3 and was by far MS's most successful console.
"We hold these truths to be self-evident - all men and women created by the, go-you know.. you know the thing!" - Joe Biden