Uh...
This was both good and bad... The introduction was really long and boring, and quite frankly, unnecessary. I think that all the scenes that were described with text instead of in-scene action/dialogue were kind of lazy and unnecesary.
I think you should come up with some more interesting dialog that would expose each of their personalities. Looking at pictures and reading text just doesn't make for a good movie, in my opinion.
Who was that old man, who apparently thought he was Yoda?
The artwork was pretty new to me, and looked pretty good. The only problem I had with it was that sometimes it was hard to tell what was going on. A couple of times, the ninja was standing with his back toward the screen, and his body was covering up the guy he was fighting. There is a trick used by Disney animators that you might find useful. Draw sketches of the characters first, but make them all black. You should be able to tell what is happening without seeing any of the detail. It's called "the silhouette test."
But a lot of the animation was pretty well done... The characters looked a little funny, but if that's just your style, that's cool. Keep them coming, just work on your writing.