My opinion: Good film.
I just caught this film on cable today, and I remember watching it and seeing the TV show. I have to say I think for being a spinoff of a tv show, this film is really good. The acting is good, the animation is wonderful, and the story is mysterious and entertaining.
For of those who hate this film, I disagree. I will say though, that the tv show is now very bad and outdated and that the sequels to this film are OK. But, this film is a classic memory of what NICK once was, back when it had heart.