It was widely considered a beating by those that watched it and pretty much most pundits.
Were it not for the two very late consolation goals by Martial in the 85th & 92nd minute, Utd would've been on to a deserved 6-1 hiding, and far more realistic score.
The gulf between Utd and the teams you mentioned is vast, and I highly doubt conceding 4+ goals in away games at this rate is conducive to attaining CL football.
That said, barring this preordained result, Utd had been making progress of sorts since their opening two games, but I'd be very surprised if anything higher than 6th is achieved this season.
One need only look at Arsenal under Arteta, had an underwhelming couple of seasons whilst quietly clearing the squad of dead wood, and this season they're 'clicking' like players possessed. But I would put my Man U Entitlement Hat away for the foreseeable, because as long as you have Maguire in that back 4 I'd expect opposing teams to post cricket scores to be honest!