I think ideas are represented, but unless it is a documentary, it is not going to be anything but a representation, a caricature. Even documentaries, because time is recorded and then re-edited into something that people can hopefully connect with, are metaphoric. Biopics, if you see a movie about someone, it is never ever accurate, and they never have been accurate. Liberties are always taken, more so in the golden age of films.
People of color are not represented very well. I think that is changing. There is an effort. For the longest time I've found it mildly offensive that if a film needed super tough heavies, it would almost always be a large black man. Take Tim Burton's Batman for instance. They are in the tower and who shows up and gives Batman a proper fight? A large black man. How many times is that the case? They are bad ass. Some might be consider it to be a compliment, just like a beautiful woman, a Marilyn Monroe type cast in a role would be considered a compliment. They are just stereotypes. I think things are changing. I remember a time when the notion of a gay black man was considered as realistic as a unicorn. Seriously. Back in the 1970s the notion was the topic of jokes. Being gay was a white person's issue and it use to be confused with pedophilia. Ignorance.
Well, that is one way of looking at it. One point of view. These are just my ramblings and tangents. By the way, I am not big, black, gay, or a pedophile. I am on the spectrum though, and the people I see on television and in movies will never represent me. I still often enjoy them. The best I can say is aspects that reflect me are represented, and they are not always autistic, but as a whole I am not represented. I'm okay with that.
I hope I did not get too off topic.