Yea, a team that goes to a BCS bowl usually has more success than a team that doesn't.
Your correlation discounts coaching of teams. Penn State JUST got into a BCS bowl, and they haven't had bad recruiting classes.
Auburn almost fired their coach and they've been to one BCS bowl game.
Notre Dame JUST GOT to a BCS bowl because of the BCS rules.
Florida State barely wins their conference and has a worse record (see KSU over OU)
The correlation between recruiting and BCS appearances, or teams that do well doesn't hold up because you keep changing the parameters. A team that does relatively well can do so for many factors, and recruiting is one of them, NOT THE primary or the MAJORITY reason.
This is what you do not get. You cannot at all say that great recruiting classes = success because there are just as many examples of it going the other way than just one recruiting class.