I'm of the mindset that most catchers can call a pretty decent game. I don't doubt that Tek is better in that area, but I don't believe that it's enough to justify overpaying for him and his abysmal bat.
I also won't take 2006 Schilling, Beckett, Lester, and Jason Johnson seriously. They all had their own huge issues over that entire season, never mind just August. David Wells seems to have done pretty well, eh? Besides, saying that Jason Johnson sucked because Tek wasn't the catcher is, itself, laughable at best.