I don't fully understand the psychology behind it myself. I think QBs become the de facto faces of the franchise, and so, as a result, it becomes chic to think there's something wrong with ours and that the guy with the Giants, or the Stealers or whoever is better. Because acknowledging we get better play at that one position is tantamount to saying our team is better overall somehow. As I said, I don't get it.
There are a bunch of teams who have guys good enough to win if the team around them is good enough. We're one of those. The Giants are, too, obviously. Then there are borderline cases like the one in Philly, or with the Jets, or with the Ravens. But overall, it's not that hard to evaluate QB play when you see it on the field.
At the end of the day, though, you have to pass effectively and make it hard for the other guy to pass effectively. You do that, you win more often than not. It takes both sides of the ball to get there, and that's fact, not a matter of opinion.