Even Moyes beat Swansea in his first game.
Still. It's far too early to judge. I think there was a lot of hype around Van Gaal and so losing the first game has shocked everyone and made them lose perspective. People judge far, far too quickly on the basis of single games these days. Everyone has a definitive opinion on a player, team or manager after one result. I remember saying the same thing this time last year when the knifes were out for Wenger after losing at home to Villa. Also United's advantage will be in the winter months as all their rivals are in the Champions League or Europa League.