It would be very discouraging if Brady was anything BUT "cranky" and super focused about this game. It sounds like it's rubbing off on guys like OchoCinco (and hopefully others) which is big, given the team's tendency to choke in playoff games recently.
I'm sure that the idea of potentially losing to Flacco, Sanchize and Tebow in consecutive playoff games is something Brady would find unacceptable to, say the least. The Pats have a fairly easy road to the Super Bowl this year, and to squander that against an 8-8 team because they come out flat again would be disastrous for this franchise and its fan base.
This is our game to lose. Only way Denver upsets us is if the team isn't focused for a third straight year. Brady seems to be doing everything he can to make sure that doesn't happen.