Rene Ritchie, writing for iMore:
Couldn't agree more. I was one of the users who had problems with Passbook after upgrading to iOS 6, because tapping the App Store button at the bottom of the empty "wallet" would give me an error. Even when it started working days later, it was unclear what exactly I was supposed to be doing.
I went in expecting a seamless experience, but what I found is that you have to actually download all these other apps you don't need just so you can tell those apps to add a card to your Passbook. The whole point of Passbook, in my mind, was to eliminate the need for those dozens of other apps. It's pretty disappointing that Apple took such a great idea and released it this way.
Go read the rest of Rene's post, it's full of other insights.