I didn't see the movie in theaters since I wasn't even born when it came out, but I did see it on CN when they still have Cartoon Theaters. Man, do I miss that block. Anyway, I thought that it was really powerful, moving and quite an enjoyable film to watch. I loved how Fieval struggled so hard to find his family and just when he about gave up, they found each other. I thought that was so wonderful. Looking back on it now, I would definitely be able to understand some of the aspects of the film better, such as the idea of America being practically heaven for the mice and the struggles immigrants had to face with work and such when they did come to America.
As for Fieval Goes West, I thought that it was a pretty good sequel. Perhaps not as good as the original film, rarely are sequels outside of Pixar are that good, but I thought that it was a decent sequel. The third one was kind of cute, but overall weak and I especially found it odd how they made the entire second movie nothing but one of Fieval's dreams. I haven't seen the fourth one, but I don't plain on renting it. Not only because of what I've heard of it here, but the fact that I rarely go out to rent movies anymore, unless I'm writing a paper on a television show and/or movie.
Anyway, I definitely loved watching An American Tail. I should probably look up some of Bluth's other films like The Secret of Nimh and watch them again since not only have I not seen them in ages, but they're also great animation films to watch in general.