This is a movie from my childhood that I still enjoy. It is shocking how nowadays, this movie is basically bashed on for many reasons, be it because of propaganda or some other silly reason.
Yes, it's not something to write home to, but you have to remember, this was made for kids, a target audience that can basically watch any cartoon without question. And yes, he does seem like a rip-off of Superman since he has his superpowers, but you know who else ripped off Superman? Mighty Mouse and Underdog, and I don't see anyone batting an eye at how cheesy those two cartoons can be nowadays.
So, the movie is basically your typical superhero origin story: Robbie, a normal rabbit, lives a normal life until he sees his family in danger of a rockslide and transforms into a star-spangled bunny on roller skates to save them. An old wizard tells him of his destiny, and he goes to the city to get a job, only to go cross country with his friends when the club he works at gets demolished, using his newfound powers to save his friends from the weasel bikers that are working for Vultor.
Yeah, the plot does seem like it can be weak, but it works. And while it does have flaws, you have to remember even classic superhero films like the first Superman movie had its flaws as well (especially the time travel scene where he reversed time to save Lois, which basically left the question of the second missile unanswered). The movie has some good voice acting, especially from Barry Gordon (who would voice Donatello and Bebop in TMNT the following year) and the late Lorenzo Music (best known as the voice of Garfield and the first voice of Peter Venkman in The Real Ghostbusters), and the music is also good. And while the ending is a letdown, you have to realize Robbie needed the pep talk because he lost since Vultor threatened New York City if he interfered, and losing is something every young kid has to go through and they need a pep talk to help them do better next time.
As a movie from my childhood, I think the old saying "Don't judge a book by its cover" applies to Adventures of the American Rabbit as well as many other animated films that have gotten a lot of hate. While it may not be a masterpiece as some Disney films, it's still a charming cartoon movie that should at least be given a chance before passing judgment.