You should see...

Current "ardently recommended movie" is: The Grapes of Wrath, 1938 version.

Once you get past the 1930s-style acting... and realize that the movie is contemporaneous with the time of the book... it's pretty amazing to see the Joads when the Joads existed... the scenery really does it for me.

Also... the acting is surprisingly good and, at times, surprisingly subtle, but conveys a LOT. There's a lot of really good non-verbal character development.

I recommend Netflixing it. Yeah, it's a classic movie, so what? They're good for you, AND they're entertaining, without the "commitment" of reading a book. If you watch a classic movie, in my mind, you get credit for reading 75% of a book. Two classic movies is like a classic book and a half.