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You are right. Man United don't only have bad quality of attackers, they also have bad defenders. The number of conceded goals in this season describes how bad the quality of Man United defense. How can the conceded goals higher than the number of goals they made? This is a really big problem for Ten Hag, he didn't have enough good defenders. If Man United always have a problem on the defense line, they will never be a stronger team. If I were him, I will rebuild the defense line, I will change all the current defenders.
However, the attacking line is performing very badly. If we look at the stats, Man United only can score 52 goals so far. This is the lowest number of goals among the top teams in EPL. Even Aston Villa, Newcastle, and Chelsea can score more than 70 goals. I think the main problem of the attacking of Man United is about the striker (CF). Hojlund still can't play as a real machine goal, his stats of scoring goals looks too badly.
I admit that many fans are very unhappy with Manchester United's recent achievements with Ten Hag. Goal productivity is not good, while the defense is very bad. But basically the players' roles are correct, it's just that sometimes I don't see their midfielders really helping the center forward to score goals.
You definitely know what I mean and of course this is about the lack of good cooperation between the players in the squad. Bruno Fernandes scores more goals than center forward Rasmus Højlund and that is not a coincidence but an impression that Bruno does not support other players to score goals. Bruno's role tends to be like a second striker instead of an attacking midfielder, but that makes it very difficult for the center forward to score goals which makes the team's goal productivity low.