I think that Santana is genuinely overrated. I took him too early. And I still have him.I got caught up in the herd mentality on draft day.
He seems to suffer from the same mental lapses that haunt Contreras. In both cases no one doubts their ability from the neck down -- but 90% of the game is half mental, as Yogi says.
Right now, I'd say the most comparable player to Santana is Odalis Perez. Perez has a few more years experience/maturity as a starter so he's having a better year. They are both potentially #1s capable of spectacular games -- but they are also prone to inconsistency and the occasional mind-boggling meltdown.
I don't think has the mindset that will allow him to Bulldog his way through a high-pressure game, a la Martinez, Clemens, Schmidt, Halladay, Woods.