'You cannot trust Man Utd to see out a game' - teething problems or real issues?

[BBC] Manchester United fan Beth Tucker says Michael Carrick substituting Marcus Rashford at Everton on Sunday was the reason the game ended as a 2-2 draw. She called the substitution a "big mistake" - though Carrick explained the change was precautionary after the forward had "felt something" - but also went on to say it "was one of many" and that, at the moment, "we cannot trust Manchester United to see out a game of football". Added to that is the view of former Premier League striker Clinton Morrison, who has pointed to issues in defence for United, who have conceded six goals in their opening three games. In the post immediately below this one, he argues that the Old Trafford side needed to buy cover for Luke Shaw in the summer window, and that a centre-back pairing of Lisandro Martinez and Harry Maguire is no upgrade on last season. So, what do you think? Is it just teething problems that are easily solved, or do United have real issues defensively? Get in touch with your views here