Don Bluth films DO rock^^ I mean, they were some of the first videos I saw and owned as a toddler. I've really been meaning to rewatch An American Tail over, too. Been... many years! When I rewatched ADGTH for the first time since I was little and didn't understand alot of the concepts, I realized how quite mature of a cartoon it really was. And, the bad concept of it too that "All dogs go to heaven, because unlike people, dogs are born loyal and kind". I was just like nodding and going "mmmhmmm....". But that's beside the point^^ Still a great movie. And just like in the Don Bluth movies with (the ORIGINAL) Land Before Time and so forth. I even enjoyed that Rockadoodle one, and wish I could rewatch it one day, but I sold it years ago :/ Just you know, wanted some nostalgia^^
As for Secret of NIMH, I read the book but only seen part of the movie, although I did see the sequel a while ago. An American Tail's sequel was definately a gooder (the first sequel, that is^^ Haven't even seen the other two).
Speaking of "dark movies", I have been slightly disturbed by some cartoons. Saw the last half of the Watership Down movie and I was like "0_0..." Looked into a movie based on a book by the same author called "The Plague Dogs" which looks equally, if not, MORE disturbing :/ Like oy, they are NOT for kids! Heck, don't even think I'd want to watch it after viewing screenshots >_<
...I'm done my ramble of the day^^