among all the albums of that decade, I think the worst was the MDNA. Calling Martin Solveig to produce the album was terrible. Even the collaborations with William Orbit seemed without identity, tiring and far from what we heard on Ray Of Light.
You can feel the same in Rebel Heart, but the quality of production is much better. As Madame x, I believe it is an introspective moment in her career, but she really needs to forget some things like bullfighters and Latin culture.