To Kill a Mockingbird is a great example. Also, The Shawshank Redemption, Big, Sicario, and to a lesser extent (meaning perhaps not SUPER OBVIOUS), Michael Clayton.
I've written a few stories where the MC is not the protagonist and while I enjoy the process, the challenge of getting readers from professional services who haven't been otherwise brainwashed can be a frustrating endeavor. The last script I sent out I had two readers say there was "a perspective problem." Rather than arguing, I decided not to use them again though I don't mind taking shots at articles from time to time like I did for Sicario where Cinema Blend faulted the movie for a perspective problem in their review - sometimes you've just got to call them out and hope they'll eventually see the light.