It's difficult to imagine a Peyton Manning offense that doesn't put up prolific passing numbers. In 13 seasons as the starting quarterback in Indianapolis, Manning averaged over 4,000 yards and 30 touchdowns per season in an offense that certainly emphasized the passing game.
While the Broncos were strong in their debut preseason game, defeating the Bears 31-3, Manning's showing wasn't as strong. The four-time AP NFL MVP completed four of his seven pass attempts, but threw an interception in his only trip to the redzone.
Manning is certainly one of the wild cards for fantasy owners as it's going to be difficult to predict Manning's success in a new offense, one year removed from a neck injury that reportedly drained a lot of his throwing strength. However, Manning has been productive throughout his career based on his ability to out-smart everyone around him and that shouldn't change in Denver.