How much do prep ratings matter? Of The Top 100 picks in the 2007 NFL draft, 57 weren't four- or five-star commitments

I never got the point of prep ratings. These are 16, 17, 18 year old kids. Their physical and mental makeup will alter DRASTICALLY before they can enter the draft. Guys lose their love of the game, get caught up with different scenes, get lazy, just grow outside of prototypical football shape. They're just kids and kids change as they grow up.