Peyton Manning
Donovan McNabb
Bernie Kosar
Tim Couch was actually fun to watch. He could make spectacular plays, but when Kevin Johnson is the best receiver that he ever had, it's pretty obvious why the team didn't have more offensive success.
It's before my time, but I love watching old films of Otto Graham, Norm Van Brocklin, Len Dawson, and Tobin Rote. Four very different styles, each one of them among the best of all-time.
I do enjoy watching Tom Brady under pressure. His playmaking ability plummets to nothing and he starts screaming at teammates and officials. The Super Bowl after the 2007 season warmed my heart greatly.