Everyone valuing championships, take a look at the final four teams the last 20 years. If you had to pick 1 one of the 4 QBs each year to lead your team into the next season, I'm willing to bet you'd pick the Superbowl winning QB less than 10 times.
Off the top of my head, Superbowl winning QBs I wouldn't take over the other 3 - Flacco, Eli, Dilfer, Brad Johnson, Rypien, Aikman, etc.
Some of those guys are obviously good, but the point is, the best QB doesn't always win the Superbowl. It's a team game.