Hey.
The intro was really good, with the sound and then the characters came in. And also little touch with the humour. I have never watched these series so thanks for the note, also, at the beginning; yet it was a bit fast! I'm not that fast at reading, yet ;-P
I was really impressed with the openning scene, the graphics were really nice, bold colours, and with the backgrounds that complimented the other colours around it, you have a nice touch when it comes with shading; except you didn't shade the characters.
The animation was alright, it was more motion tweening then FBF - except for the hair - which is really what that style is mainly about so I liked it, except for when the people jumped out of the way of the arrow, it looked like they were flying; was that on purpose? Where they supposed to fly?
The graphics were really good, the proportion for the characters relating to themselves, backgrounds, etc. was really good, I was really impressed in what someone can achieve in Flash, and the ending graphics were nice, with the shading.. maybe you could implement that into the main movie.. I know it would take longer, but it would be a great touch.
Like I said I haven't really watched the series, so it was reasonably confusing on what was going on, however I will hopefully get around the watch the rest, but it looks real promosing! :)