The likeability is simply not there. Ronaldinho was likeable, R9 was likeable but Neymar isn't. Reasons being his antics on and off the pitch. But, purely as a footballer he is spectacular and has that genius about him. Injuries and bad decisions means that he has been unable to translate that into success.It's the same for Neymar to be honest. I'm sure he'll be revered after he's retired. Has Ronaldinho's flair and near-Messi production combined with Ronaldo's likeability. He's a greater footballer than Ronaldinho though in my opinion though (and Ronaldinho's probably one of my favourite players to have watched ever).
As far as greatness is concerned, Ronaldinho will always be considered greater for those 3 extraordinary seasons at Barcelona and the integral part he played in the 2002 world cup win for Brazil. Interms of talent, they are similar.