Super Mario Land 2 is very well done.  You can tell what a difference a few years makes in graphics comparing Super Mario Land 1 to this game.  The game has a nice big world to explore and is much more expansive than SML1.  The game does have that Super Mario Bros feel to it.  One thing that is weird about this game is how high Mario seems to jump in this game.  Every time I play it he seems to hit the ceiling of the screen.  His jumps seem floaty as well and not dead drops like in the classic Super Mario Bros.