Not surprisingly good, but still a very good game.
Gameplay- 10/10
I mean, its mario!! nuff' said
Graphics- 9/10
The graphics are done extremely well and its one of the best games to have that 3-D/2-D feel to it.
Sound- 8/10 meh, nothing special at all catchy music though but that about it
Value- 9/10 this game has tons of replayability from collecting big coins and unlocking new levels or spending coins
The difficulty on this game ranges to easy to pretty hard it can get frusturating at times but not any times where its like " AHH i got smash the friggin DS" so its fine.
Overall New Super Mario Brothers is an AAA game, but don't expect any thing SUPER DAZZLE SPECIAL!!!.. a game that should be in every DS owners library.