I'd be saying that it was one poor result and not enough to undo a lot of good work, which is what I have said repeatedly about Ole. If we put in a performance like that at home in a big European game I don't care how long the manager has been there, it's unacceptable. 1 shot on target? No. That should never happen at your own ground. Has Ole had enough time to fully leave his mark on the side? No, but he's had enough time for the team not to be as poor as that. But it's only one game and it's his first loss .. so really it isn't a big deal, is it?
I think the 'we lost because of two injuries' thing would carry more weight if you had looked at all threatening in the first half, but you didn't. For me the game didn't really shift that much from the first to the second half, about 30 minutes in I was saying that I thought PSG looked the bigger threat in behind and that United would get frustrated. I think the injuries are a bit of a convenient excuse for what always looked to be a poor performance, it's especially poor when you consider they were missing two of their best players. Yes though, they are better than you, and losing to them is no embarrassment .. it's just the performance was limp and lacking in any fight, which is never good enough for United.
Ok, a 'perfect side for counter attacking' is an exaggeration, but overall I don't think you have too bad a side and the lack of talent in the side has been overplayed. You've got arguably the best goalie in the world, international level defenders who all cost a pretty price, you're weak at fullback for sure but in midfield the likes of Herrera, Pogba, Matic, Fred etc offer decent balance and some genuine world class talent. Martial, Lingard, Rashford, Mata, Sanchez are hardly poor attacking options, are they? It's pretty clear Mourinho was doing a shit job and United do have some excellent players, now after one loss people are saying there's some huge rebuild job needed? You could do with 2-3 players coming in, but so could most sides. He's hardly working with scraps, the injuries against PSG hurt you but maybe move Lukaku central and Rashford out wide? You keep some pace in the side, you offer a different kind of threat in the middle. We know Lukaku can be an effective threat for other teams, he is for Belgium and he was for Everton and even United last season.
I've seen plenty of United fans push the argument that it's all down to Mourinho and you have a very good squad which would be challenging for the league had Ole been here since the start. Either they believe Ole is some management genius on par with Ferguson, or they think you genuinely have an excellent squad, until it doesn't suit the narrative.