edit: I'm just talking about the top-10. Clearly all of these players are among the greatest ever.
The list is good, but I have some issues with it.
#1, Peyton Manning is awesome, but he doesn't belong on this list. Not by a mile.
Guys like Bart Starr, Otto Graham, Joe Montana, Roger Staubach, and Johnny Unitas (yes, here's on there) all, IMO, belong on the list before Manning does. That doesn't take away from how unbelievable good he is, but I think that it's a little biased to hop him up there over some of these other guys who (a) didn't play indoors and (b) played under rules that make their numbers and accomplishments more impressive.
Even guys like Sid Luckman and Sammy Baugh (both pre-modern) belong on there before Peyton. Luckman in particular... he is still #2 all-time in YPA, despite playing in an age when receivers got murdered and running dominated offenses.
Butkus definitely doesn't belong on there and Peyton, while he was amazing, should take a back seat to some other players.
Jerry Rice shouldn't be #1. Sorry, he was an amazingly dominant receiver (probably the second most dominant ever), but there are other positions that are far more valuable to a football team.