Im a bit behind on the MDNA talk... my take on it is that the album is her worst by a large margin. The reason being that for the first time ever (and last so far) in her career the music didnt have any soul, depth, elegance or sophistication to it. Madge albums up until that point, as different as they were, all had in common excellent production (yes, even Hard Candy), but MDNA had nothing going on for it, weak beats, terrible mastering, cliche lyrics, and her vocals are very questionable too.
The album sounds rushed and cheap... something new for a Madonna album. Theres only 1 song thats worth it in the whole project for me, thats Love Spent. The melody is top notch, the production is interesting and dynamic, her paper thin vocals make sense with the chaotic beats, and most important the lyrics feel honest and are captivating, Love Spent is one of my favorite songs of hers post confessions, behind the muddy production theres a heart thats aching.
Madonna is as smart as it gets, and with Rebel Heart she corrected most of the issues present on MDNA, the music had soul again and it felt like she cared about the project. Rebel Heart is true return to form for me.