If Manning didn't slide early and got Trent Green'd, everyone would be ripping him for not sliding early. It's not worth your franchise quarterback getting knocked out of the game for an extra yard or two. Jim Sorgi is going to come in and win the game for the Colts? Give me a break.
On a side note, kudos again to Tom Brady losing a game and not shaking anyone's hand afterwards. I called that one days ago.