The answers to this will surely differ depending on how much people have enjoyed this novel. There are some people who seem to think that this is one of the best novels of all time. There are also some who think that it is overrated mainly because the real racism of the book is downplayed.
Usually, you can decide if the novel is overrated for you or not based on the emotions that you have felt while reading the novel. If there were so many emotions that you felt while reading, this may be a sign that it is worth a read. You cannot force people to agree with you though. Your view about the book may differ depending on how much you have enjoyed it.
Credible journalists seem to think so. In a recent issue of The New Yorker, resident bright boy Malcolm Gladwell makes an argument that To Kill a Mockingbird, as a product of Jim Crow liberalism, is itself inadvertently racist. Its villain isn’t Southern racism in general, which the book downplays, but the viciousness of “poor white trash.”