I'm sure there's something to be said about personal strife inspiring an artist's best work, but I'm not sure "emotional" work and "superior" work are as synonymous as people think they are. A mediocore saxophonist can write a piece and dedicate it to his ill uncle, but if the piece doesn't sound good, then it really doesn't matter how emotional it is. (Oh, and I hear those shouts of Tupac and Kanye out there; I hear everything. So you think Tupac and Kanye are mediocore now?)
On the other hand, a exceptional artist can basically sleepwalk through a track and that track will be concidered a classic. (*cough, cough, A Milli, cough cough*).
Good is good; bad is bad; but when feelings get involved, we tend to let some stuff slide.
Music makes us empaths.