I'd recommend the JUCO system for just about everyone. It's a better investment for most people and many of us need a couple years to grow up and take our academics as seriously as we should.
Unfortunately, what we often see with athletes is a travesty. As you mentioned, all too often they're passed through junior high and high school with the path of least resistance so that they can remain eligible. Then, some don't qualify and end up at a juco or barely qualify and end up at a college that doesn't give its athletes a regular college education. Instead, pushing them onto a degree path that's less rigorous and less valuable for gainful employment upon graduation. Sadly, many athletes end up as the first college graduate in their families but come out of it with few career options because they don't have real degrees. One thing I love about CU is that it doesn't have watered down majors and that its athletes graduate with the educational foundation to be successful after football.
It makes it harder for CU to bring in juco athletes, because many jucos focus on keeping the athlete eligible instead of preparing him for the 4-year college he'll want to go to after receiving an associate's degree. I was very happy to see that the NCAA finally stepped up this year by limiting the number of PE course and raising the core requirements that need to be on a juco transcript in order to transfer into a D1 program.
P.S. I'm sure you see a lot worse than I have since you're in the midst of that Texas high school machine. When I see communities spending millions on football facilities when they have less than ideal student/teacher ratios, outdated textbooks, lack of computer and science labs, etc., it makes me so damn angry. And I say that as an obsessed sports fan. Too many people don't have their priorities right.