Many people believe that being autistic coincides with being a genius in some aspect. While it is true that some autistic individuals have extraordinary math, music, and art skills, this number is nowhere near the majority-in fact, relatively few autistic people function outside of the normal range in any skill. This stereotype is perpetuated in the movies and on television, because the story of a talented person fighting disadvantages (such as autism) makes a good plot. However, this is not the norm, so nothing more than the best they can personally do should be expected from an autistic person. However, it is important to note that autism is not a form of mental retardation. Some autistic people are mentally retarded as well, but most are not and should not be treated as such.
In the end, the most important lesson to take away from your studies on autism is one of tolerance. You will probably need to be patient when dealing with autistic people, but by understanding a little more about the disorder, perhaps this will be easier. Learn what you can and spread the knowledge to those you know to help create a more tolerant setting for autistic individuals in your community.