I don't think I have the greatest form when I run. When I ran with my husband and my SIL I noticed that they have the same running form. They don't even look like they are trying. They spring off the ground and kick their bums with every step. I know if I improve my form, my speed will improve. And I can help prevent injuries.
But then again, the winner of the New York Marathon looked like she was out of control a lot of the time. She finished the race in just over 2:25! That's only a few minutes longer than my first half marathon time.