Amen. The truth is, you can hardly ever tell who is going to be a good QB anymore. Over the past few years, Kerry Collins, Brad Johnson, and Trent Dilfer have led teams to Super Bowls (Dilfer's and Johnson's teams even won), and titles have been won by "who-the-heck-are-these-guys?" QBs Kurt Warner and Tom Brady, whom no one had even heard of before Trent Green and Drew Bledsoe got hurt.
I still say it's all about the offensive line, and defense. Give me a good offensive line and I'll get you to the Super Bowl, regardless of who is behind the center.
While Roethlisberger is doing a fine job in the Steel City, the reason why the Steelers are the best team in the NFL (at least this week) is that they have a great offensive line, and a good defense.
Also there is a thin line between being a Super Bowl team and an also-ran (can you say 'Carolina Panthers'?). Sure some teams may have better players from 1 to 22, and when they're healthy, they are on top. But lose one or two key players and you can quickly fall to the bottom half of the league. Over a long NFL season, it's the teams with the better 23 to 45 that prevail. It's all about depth.