Why are people criticizing Manning for his team play?

While Manning did threw the only pick. I cant really say that he not clutch. It was a great read by the defense. The interception was not an underthrown ball or a ball that was thrown to a part of the field without a receiver (like what Brett Favre did this year, 2 years back, and 5 years back against Philadelphia). The Saints had better play from their special teams and defense. Also if you look at it Brees threw alot of that could have nearly been intercepted but the Colts D failed to hold on so I cant see why this game would not prove that Manning is the best qb in the game right now.