It's-A-Him!
Title aside, this is one of the best games on the DS so far, and that is saying a lot. If you were a fanboyish player of the classic mario games (and I am) This game will give a fuzzy feeling inside, as you once again run through colourful worlds and jump high off of turtles heads. The control scheme is extremely well-tuned, allowing you to pull off all of mario's updated moves with ease. My only small issue in this department is that the running speed feels a little slow compared to previous games in the mario franchise, like SMB3.
The graphics are crisp and clean, and the 3D models make the game feel like it is vibrant and alive. The sound is involving to match.
The length of the game is as long as it needed to be, but could have been longer.
Overall this is worth the purchase for any self-respecting DS owner, classic mario player or not, this game is a masterpiece.