How anyone could ever doubt Peyton at this point, I have no idea. He

ed up in New England a few years back, yes, but if you watch him this year, there's an edge to him, like Cochese said.
If anyone still has the Denver/Indy game on their DVR, look at him on the sidelines. He's got a look whenever Denver scores as though, "

them, I'm winning this game. Do whatever the hell you want, but I'm winning this game." It was evident in the Jets game (with his spiking of the ball) and on the sidelines and after TDs, he's got a different air about him now.
As for Peyton not being able to win "the big game":
Take last year's playoff game as a scenario:
Indy gets the ball back and Peyton drives the team down the field for a chance at a game-winning field goal. What happens? Vanderjagt boots it wide right.
Let's look at Super Bowl XXXVIII Patriots vs. Panthers:
Patriots get the ball back and Brady brings the team down the field for a chance at a game-winnning field goal. What happens? Vinatieri kicks a game-winner.
So why is it that Peyton would be blamed and called a choker when he gives his team a chance and other people let him down? On the opposite side, why is it that Brady is heralded for a kick that Vinatieri makes. Going by some people's logic here, shouldn't have Brady scored the TD and not left it up to Vinatieri if he really is that good?
The defenses stepped up in both scenarios, but each QB brought his team to a point in the game where they had a chance to win. The difference between the two is that Brady had his teammates step up for him. Peyton did not.
Of all the years in which Peyton has had shit thrown his way for not doing this or that, this year thus far is not one in which he deserves any criticism. Instead of bitching so much about what he's failed to do in the past and what he has yet to do in the future, enjoy him in the now, 'cause there's none better.