Pros:
Interesting concept; Mario-esque platformer with guns.
I like the gun's recoil and the effects of bricks flying everywhere when bullets hit solid objects.
The game is fun!
Cons:
It's difficult to control your character, though to be fair, that's true of real Mario games.
The starting screen doesn't let you play two-player even though it says it does. A two player version of this game could be interesting!