They did at that. But! The problems on display yesterday though, was, to an extent, an extension of problems on display last season as well. Especially in midfield. Central midfield is not good enough to take control of a game, defense as a whole has a lot of problems handling a physical playstale and pressure high on the pitch.
Add to that an anemic offense - the part that's supposed to carry the team - and there might be more problems on the horizon.
Given, the offensive problems are most likely down to rust. Rooney looked off, van Persie just joined the team and the whole offensive nucleus needs to get used to playing together and moving to give Kagawa the right options for the decisive pass.
But last year, it took 89 points for a title. It'll probably take something close to that this season as well. 89 points is only 25 off the max available, so there's not a lot of wiggle room for fucking up too much. Think Chelsea are going to be in the thick of things this season as well, so the last thing United want is dig an early hole.