Simms: Peyton Manning Is 'Greatest Quarterback of This Generation'

Now that Peyton Manning has officially retired, it's time to look back and reflect on all of his accomplishments, which are almost too numerous to count.

How did Manning change the game of football? Is he truly the greatest quarterback of his generation? How about that other guy, Tom Brady?

Watch Adam Lefkoe and Bleacher Report NFL Analyst Chris Simms discuss Manning's greatness in the video above.