For me, Jon was perfect until season 8.
He's showed poor qualities as a commander with his impulsiveness and inexperience (battle of the bastards) but those qualities defined who he was. Brave and honorable, and it was ironically those qualities that led people to believe in him. That and the fact he was more like Ned than any other of his siblings. Robb was the better commander, and before season 8 ruined him, I felt Jon would be the better Ruler. Thought Vary's made a perfect sentiment regarding Jon as King.
My preferred ending would've been focused more on the Azor Ahai prophecy, and how they could've tied that to Dany going mad (which I still thought worked well). Instead of light bringer being a sword, it would be Jon as an embodiment. Rhaegar believed that the 'song of ice and fire' would be his son.