Mastering of MDNA overall was amazing. Crisp clear audio quality and good bass. The vocal production and engineering however was an issue in itself. You can't even understand what she was singing in the 2nd pre-chorus of LoveSpent (which is sad bc it could have been a classic M song). And the pitched vocals were also an issue (they pitched her vocals on TUTR and GMAYL way too high, creating the "helium" sound).
I'm hoping Mirwais and Lauren pull through and give us full-treble, raw, M vocals with true depth (like on AI and Music).