Well I don't think it's really Moyes's fault, RVP's rarely played this season, same with Rooney, and Carrick, Vidic, Ferdinand, Giggs, and Evra are all a year older, which for players their age does actually have a pretty big impact. And out of the players who have played, only De Gea and Januzaj have really been consistently good, everyone else has been above average at best to downright poor. Also they probably knew at the start of last season that Ferguson was going to retire, so they wanted to see him off with a title and were super-motivated to win, whereas now for the first time in their United careers they have a new manager and a completely new backroom staff, and that will take a while to adapt to, and likewise it will take a while for the coach to adapt to his players. And the competition is a lot stronger this season, Chelsea, City, Arsenal, Liverpool, Sunderland (
), Southampton, and Everton (as well as others probably) have all improved since last season. Moyes's transfer decisions in the summer were questionable to say the least, and his persistent selection of Welbeck over Kagawa is quite confusing, but I think firing him would be ridiculous.