as you know, you are looking at something for a review of new super mario bros wii. well you will get one.
gameplay: the controls are very easy to get used to. also, it composes old levels from the originl super mario bros, mario 2 and 3, and super mario world. also there are some new ones. the end of every level is exactly like it was with the super mario bros original.
graphics: the graphics are tweeked from the ds version. graphics good enough for four people to play at once.
music/backround: mostly they just made a remix of the original songs of super mario bros 1-3 and super mario world.
co-op: the coropertave wont get u angry at your friend cause he is trying to get a coin, but the screen wil get a little confusing.
overall: G4's X-play gave this game 5/5, and i agree, 5/5.
This review is lacking maybe review new things it added to the series. Also what gave it 5 stars? You sound like its just another Mario platformer. Keep up reviewing!