I always found the media portrayal of him rather strange. He was vilified after he left the Smiths, by the music weeklies. They were definitely all pro Morrissey.
His musical output is magnificent. Regardless of his Smiths output, which will be his legacy. He did fantastic stuff with Billy Bragg, The Pretenders and Kirsty McColl. Thats without even considering Electronic.
In regards to his status of Manchester most important musician, imo he is 2nd to Bernard Sumner. Think Joy Division, New Order, Electronic and then all his production work, trumps Johnny. Bernard Sumners work is truly original and changed pop music in this country . Johnny is a traditional pop artist who writes great pop songs.