Boring and unoriginal.
The animation here was sprites, but that's not always a problem; there are some sprite series that I actually used to like, because they were funny. This, however, is both a sprite movie and unfunny. Come on. Farting humor? Random violence (which isn't always bad, but in the stupid way you represented it, it is)? I was about to say "I have no idea how this got the score it did", but it's obvious; everybody on Newgrounds is a fucking child. Unless you're specifically targeting children as your audience, this is a failure.
Now that I got all the insults out of the way, there were a few redeeming qualities to this. You had a nice 1 second of animation where you actually drew Mario, and it was a decent length.
For future animation:
-Improve on your writing. The script for this was shit. I guess the "exploding the castle" idea hasn't been done thousands of times before, but all the jokes that you did have been.
-If at all possible, stop using sprites. Not a very original complaint, but yeah. Sprite movies will get you good scores, but you won't get any better and to anybody over the age of 14, you'll still be shit.
I'm going to have to give it a zero because it didn't really entertain me or even make me smile, which usually isn't very hard. Better luck next time.
Also, in before ten-year-olds say this review is worthless just because they disagree with me.