First of all, for those who are bringing up the big hands argument, I specifically excluded them in the OP.
In the case of Rondo, he's only a young player. Yet tell me his shooting hasn't significantly improved since his rookie year. He's been working on it. So has Glen Davis. Even LeBron James wasn't a great shooter. He's improved too.
It's the guys who have been in the league for years and have shown no improvement whatsoever that bother me. And yes, it's mostly those guys who are so athletic, they get by without trying. For example, a guy everyone here loves to hate, Tony Allen.
I have no doubt that LeBron could make it in this league if he couldn't shoot due to his athleticism. But would he be an MVP?
In the case of Rondo, he doesn't bother me whatsoever. He can shoot well enough to get by, he's just better off doing other things with the ball (namely pass and drive).
As far as some guys having more coordination than others, I get that too. I don't expect every guy to be Ray Allen. But even guys lacking coordination should be able to hit a mid range shot when uncontested.