In terms of first impressions, skyscraping rookie signal-caller Ryan Mallett made a good one in his NFL debut with the New England Patriots last week. The Pats' third-round pick -- and potential heir apparent to the legendary Tom Brady -- completed 12 of his 19 pass attempts for 164 yards and a touchdown in the team's preseason-opening 47-12 romp over Jacksonville. In the process, the former…