That's a bunch of people from all sides of the spectrum thinking highly of Rhaegar Targaryen, he defeated Barristan at a tourney so clearly wasn't a slouch. He was a talented harp player and seemingly a loving father and husband to Elia (from what we know).
This makes me actually wonder why Dany is ever compared to Rhaegar at all. Rhaegar was a musician, loved to read, skilled at horse and weapons, and seems to command respect because of his actions and attributes.
Dany (to me at least) doesn't have any of these qualities. (Generallizing, feel free to dispute) The people that 'respect' her seem to do so out of lust (Jorah), respect of family (Barristan), or fear of dragons (everyone else).