Considering the level of inconsistency in the Manchester United team under Erik ten Hag, I don't think there's anything wrong with your opinion is absolutely valid. If Manchester City or Liverpool were to be the team that's facing Southampton this weekend, I'm very sure you'll have a different opinion but because it's Manchester United, there's every possibility that they'll be beaten by the Saints.
Different people give their opinions here without being sentimental while others do based on their sentiments and how passionate they're about their beloved clubs but in the end, we all are free to express our opinions regarding English Premier League related issues on this thread.
Almost all of us have doubts about the Red Devils, whether it's the coach who is struggling to build or the quality of players who are declining. Even Marcus Rashford seems to have run out of time at United, Bruno Fernandez cannot work alone without a partner who can understand his wishes. There are so many issues we can talk about with Man United, but this week game against Southampton is a must win. Although there are a number of doubts about the club performance, at least with the opponent's condition also much worse, Erik Ten Hag can definitely benefit.
That's the point, or the point is no matter how or how bad the situation is in the Manchester United squad that makes it difficult for them to appear impressively, victory in the next match against Southampton is still an obligation for Ten Hag if he does not want to get harsh criticism again and also if he still wants to stay as a coach there.
On the other hand, if the match was not held at Southampton's home ground, then maybe I would be quite confident with Manchester United's victory even though they are having problems in performance, but of course as we know the match will be held at Southampton's home ground, and this is a situation that makes it quite difficult for me to put too much trust in Ten Hag to end the match with full points.