I think that's correct also. If you're dazed and standing there with stars circling your head, it's easier to hit you. . .
The only comment I'd make there is that being prone/down might either put you behind cover or conceal you from view (laying down behind a 1' log will completely cover you, and behind 1' grass will completely conceal you.)
I find that in most situations being down/prone ends up being a benefit vs missile fire as a result. The recurring exception being that it sucks to be downed in the middle of an empty street by a sniper in a window, but most of the time the result is more like "Target goes down and dissapears from view behind XXX."