Von Braun - Great American?

I don't know much about Von Braun except for what I've seen on TV. I
have some questions about him:

1. How much credit does he get for the development of NASA? Was he the
driving force? If he was not around back then would NASA have progressed at
a much slower and more dangerous rate?

2. How much credit does he get for getting Americans to the Moon? If I
said he single handedly got the U.S. to the Moon would that be a big
exaggeration or mostly correct?

3. This question has really been on my mind: If Von Braun was not a
former NAZI, you think there would be a statue of him in Washington D.C. or
something? If Von Braun was as important as they say, it sounds like he
should be put in the one dollar bill. I guess what I'm really asking is if
you think he has not been honored enough because of his NASI past?

Thanks!