Its possible that Ron, as a character, has always sort of rubbed me the wrong way. He literally abandoned his best friend and the girl he fancied in the middle of a war. Granted, part of that was due to the influence of the Horcrux, but I believe Harry himself pointed out that it was more bringing Ron's frustrations to the fore and amplifying them. That, and I wonder how much of his achievement and competency is due to the influence of his friends. If the war hadn't been on, if Voldemort really would have died and Harry was just another kid, how good would he really be? From what I recall reading, Ron's always been a singularly lazy underachiever who'd rather spend his days playing exploding snap instead of doing his homework.
Just...I've dealt with people like that. In real life, they never amount to much once they and their friends go their separate ways, which is inevitable once you leave high school. The best they can hope for is some kind of low-paying desk job. If it weren't for Voldemort and the war, Harry, Ron, and Hermione would've ended up going their own ways. Harry probably would've ended up playing Quidditch or something, Hermione would be a teacher at Hogwarts, and Ron...honestly, I'd see him getting into the Misuse of Muggle Artefacts division, at best. Even then, relationships that work in war don't always work so well in peace. Especially since, by all rights, Harry should've ended up a shell-shocked veteran since the magical world doesn't understand the concept of psychotherapy.