Has Peyton Manning Lost His Touch?

In his season debut, Peyton Manning looked like his old self. The quarterback's 253-yard, two touchdown performance against the Steelers helped the Broncos start the year with a win. It looked as if Denver could become one of the main contenders to represent the AFC in the Super Bowl. Just two weeks later, people are questioning whether or not Manning has lost his touch. Is Manning no longer a top NFL quarterback?