Most people praise him for the lyrics which I think is the least important aspect of music. As someone with CAPD, I have a hard time deriving what lyrics someone is singing purely by listening to them. I can only reliably remember the lyrics of a song by reading the lyric sheet and not by listening to the music.
If the Nobel Prize for literature was awarded before I discovered him that would have made me more preconditioned to dislike him more as it would bring up a question of how can a musician be so celebrated for something that is unrelated to the music. If anything this nobel prize for literature does him a disservice as it adds to the reputation that he is a great lyricist but mediocre musician/songwriter.
Then there is a reputation that a lot of people think he is a "bad singer" predominantly due to his unusual. I have heard people use Dylan as an example that you don't have to be a "good singer" to succeed in music.
As someone who likes professionalism this then precondition to dislike his music further
I think George wrote his melodies as "rudimentary".
So my impression from reading about him is that he is a bad singer singing songs with rudimentary melodies but is remembered due to great lyrics.
So it's a big surprise that I ended up liking him (although this is most likely due to his strength as a performer/vocalist)