Manchester United is playing better football than Westham, if they continue with this present effort, they will be able to get 1 or 2 goals in this match. The Westham players are not not very sharp and strong on Manchester United but they have got a very nice shoot on target, though it was offside.
Maguire is not happing Manchester United in defence, his presence is making the strikers of Manchester United not to press very high on Westham. The confidence of the team is not in Maguire.
Marcus Rashford has just given Manchester United the lead from a powerful header. He has been improving recently, I am sure Gareth Southgate would consider giving him a place in the World Cup. Although United is dominating the match, but West Ham is not doing badly. But their attack seems inactive because they have not had any shot on target.
Yes that's the problem, people thinks the bottom team is too weak to be able to defend against the top team, but in football it's all about luck the situation can also have an effect. Also even weaker teams in other leagues can make surprises.
People have to believe it, luck sometimes plays a dominant role in the result of a match. Sometimes a club would be the better side and have many shot on targets but they might not secure a goal. But just one opportunity a weak team would have, they might score an unexpected goal and win the match. It is good to prepare for all games but sometimes preparations or player quality doesn't lead to wins.