This would be the definitive version of the game if the physics weren't messed up. Turning in the air is awful, side flips are useless, wall jumps are almost useless. They took some of the best movement in gaming and absolutely ruined it.
The improved graphics are really good and the new characters are (mostly) fun! That being said, the downgrade in controls and physics is not worth the extra content. Stick with the N64 version.