I don't usually write reviews, but since I did not find any sound review here, here it is.
The movie builds up great, great character development, good acting, intriguing plot; and then the third act begins, and it's all downhill from there. All buildup and character development stare into abyss upon an obvious climax. The realism that was there in the first two acts dies in the third act, and questionable choices are made in the plot, which makes you doubt whether there are different writing teams for Native Son. P.S I haven't read the book.
I think this will suffice.
Review of Native Son
