I guess 'like-ability' is really a subjective thing in the eye of the beholder so we can all agree to disagree on that.
In terms of his status as a player I guess it depends on definition. I see him as a second tier player, ie if 'great' is the best of the best eg Dustin, Royce Hart then Jack is on the next rung.
No disputing first point but I'll concede Jack was a liitle egocentric in his early years and said or did a couple of silly things but hey, most of us grow and learn to mature. It can't be easy growing up in the public eye in another state away from your parents and family.
I also have no qualms with your 2nd point: I used the term 'great' but I put Royce and Dusty into the living legends category along with only a handful of of others such as Richo, KB, Bourke from my lifetime and actually seeing play live many times.
However, thinking of it more, JR8 may well be elevated into this Legnd tier by the time his career ends. It might depend a little on how he goes from here and if he can regain form and wind up his career near his high rather than decline quickly and be washed up in the next year or so. When you think about it, his time at RFC has coincided with the club's return to greatness and 2 flags - during which he has often had to succeed as the one and only tall forward, which he has achieved superbly overall. Along with turning into a great team-first player, involved in creating and setting up as many goals for others as himself once Hardwick asked to him change his focus, lay tackle/blocks/ handball/ passes etc. Even the great Richo, as good as he was, did not manage to achieve as much, although he wasn't fortunate in terms of as many of our current greats coming onto their prime concurrently with him.
Only time will tell.