Excellent!
'Ma Rainey’s Black Bottom' features great performances from Viola Davis (Ma) and Chadwick Boseman (Levee). Their characters aren't flawless, yet Davis and Boseman make them each a fascinating watch; the latter has one film-stealing scene. They both truly give their all. The other cast members, spearheaded by Colman Domingo (Cutler), are good as well.
The plot is riveting and very well told, with near perfect pacing and an astutely chosen run time; a 2hr film, for example, would've dragged. The end scene is a noteworthy one, also. There is a lot to enjoy here, even for a story filled with sadness and injustice. Highly recommend.