Possibly one of the most satisfying games ever released.
After all that time, it retained every last bit of its charm.
Summarizing the game would be pretty pointless, so suffice to say that players take control of Mario (or Luigi) and guide him to the right-hand side of the screen.
The Wii emulation is spot-on. The graphics are faithful to the simplistic NES original, which is good, but it's hard to rate the game too high or low for this aspect. It works, and it doesn't detract from the gameplay. The sound, however, seems a step up from the NES cart. It's hard to explain, but it feels less like a monotonous pounding from one speaker. My only issues remain with the controls. The Wii remote's 1 and 2 buttons are slightly too small for my taste, but this is the best option for control. The Classic Controller seems very uncomfortable, since the A and B buttons are layed out like a SNES controller and there seems to be no way to remap the buttons.
As far as the gameplay goes, this is what platforming means to my generation of gamers. It is simple--yet versatile--and it is oddly gratifying to complete certain segments of the game, and to do so with any semblance of style is a rewarding experience. The level-design is remarkable, matched only by future Mario games, and the game can be played in short bursts or in marathon sessions.
I don't know why anyone would bother reading a review of this seminal classic. Spend five bucks on it, and be glad you did!