That why is good to be good if assume Manchester United did well last season many will have considered them the way you thought, even I personally didn't condemn them because I have the same thoughts as yours, likewise I consider the opponent to be playing well better then them because it a privilege to them for playing with a huge team like Manchester United and also most of the players there really want to take advantage of that to make themselves popular for other big teams to see how they are performing to get lift up. It even too early to judge, let see how the senior men will play when the league starts.
Your closing statement gat me, saying it's too early to judge is very true but then we can get hints to what we should be expecting from that which we have seen now. One thing I'm really happy about is that even if Manchester United have been of a bad form, they are still recognized as a big team, they still have some of their glory intact. Small team usually do that and it's not new because ordinarily people may not pick interest in watching them except when they play against big teams like this, it's an opportunity because it's believed if you can perform so well against a big team then you have gat great potentially to been a good and notch player.