I think the Jazz are very conservative drafters, low-risk/low-reward, at least in the first round. In the second round, they seem to take a few more chances on athletic talent and draft for longer term. Case in point: Koufos over DeAndre Jordan.
The Jazz also have relatively late picks in the first round, tend to draft for position and lock in on a few players each year. They figure that these players they draft aren't going to get much court time anyway unless it's a position of need.
The Kris Humphries over Al Jefferson thing was excusable since Humphries had talent and a track record in college. He just didn't turn out to be a heady, motivated player. However, the Jazz should have known that Snyder was a headcase who couldn't shoot, whereas JR Smith was a headcase who could shoot, and Josh Smith was so athletic that it didn't matter much if he could shoot or not.