Don't be too fast brotherly, it's only one game they have played this season, so judging their overall performance so far is myopic in my own perspective because they haven't even played up to ten games and you are concluding that they are 3-4 times better than last season, just wait till their first ten games, that's when we all are going to know if they are as good as you are claiming or it's initial gragra as we normally called it in my country.
If they can get up to 18 points from their first ten games, that's when am going to be convinced that they are better than last season, but till then, they are not that different from the Manchester united team I know last season.
You're right — we shouldn't rush to conclusions. After all, it's Man Utd

, and it's only the first game of the season. Everyone wants to make a good impression, but also not lose the match. Arsenal played it safe, while Man Utd looked like they want to give more this year to the crowd.
But you have to admit, they looked much more solid compared to last season. There was more running, better cohesion, and some nice moves. That gave me a bit of hope for a better future for Man Utd.