7. "RE: Why is Prince criticized for his post-prime work more than any other..." In response to In response to 0
The fact that P puts out so much material provides constant new music to compare to his peak years. His one album a year pace of releasing albums is an annual reminder that his new stuff isn't as strong as Purple Rain or Sign. Bowie, the Stones and Stevie disappeared for long stretches after their respective golden periods giving the critics (and there were many) a lot less to beat up on.
Also, his pace of releasing new music killed any quality control. I know that the "album consolidation/editing" exercise has been done before but imagine combining all of Prince's stuff from 1990 until now (almost 20 albums) into five to seven really strong records. That would give his current reputation a very different feel.
Instead, we've gotten the uneven output of the last two decades.