Hi Mr Spank

The lack of response may be because of the forum you are posting in. The Aviation Top 100 Questions forum doesn't have that much to do with your question.

I am a Danish pilot and in Denmark you have to have fairly good grades, but the Air Force will test you themselves and lean more to the result of those tests than anything else. In US I think you need to have good grades to become a pilot. Their selection process is far from as thorough as the one in Denmark, so I would think they tend to lean towards the previous grades.
When I went through testing in Denmark it was only like 2 percent of the ones they accepted for testing that made it to the actual pilot training.