Some folks were upset Cardi B won Album of the Year at the BET Awards -- but not Mary J. Blige ... whose opinion MIGHT just matter more than yours.
The Queen of Hip-Hop Soul was leaving TAO Sunday night in Hollywood after the jam-packed show -- in which Mary herself received a Lifetime Achievement award -- and she told us how she felt about CB getting the big prize over the other nominated artists.
Mary - Cardi - S*** - Questions
Check it out -- Mary's got nothin' but love for Cardi, whom she thinks "deserved that s***!" ... no questions asked....