Robin van Persie, Wayne Rooney, Juan Mata and Adnan Januzaj are four of the best attacking players in the Premier League.
However as a quartet – in the same team - there's a serious problem.
When Mata arrived at the Theatre of Dreams, many thought United's attacking line had become the best in the division. However, a couple of months later and serious questions are being asked of United's forward stars.
The Red Devils hit rock bottom (again) against Liverpool yesterday afternoon. Vulnerable at the back, average in midfield and non existent in attack, Moyes' side looked a shadow of the Manchester United teams of the past.
But, the biggest concern for the Manchester United boss, has to be his attack. It's clear for everyone to see that United need new defenders and midfielders, but Moyes must have thought his forward line was good enough to compete with any team in Europe.
That's just not the case...
In the past, the Red Devils have had pace down the flanks in the likes of Ryan Giggs and Cristiano Ronaldo. They've also had wingers ready to run for every single ball in David Beckham and Ji Sung Park.
Now though, United are left with exceptionally talented stars who just can't work with each other. And arguably that's not the fault of the players.
Juan Mata is – and always has been – a number 10. Wayne Rooney is – and always has been - a No 10. Adnan Januzaj isn't yet – but will be in the future – a No.10.
Let's not forget that United have another No. 10 in Shinji Kagawa, who is played on the wing or stuck on the bench and the Red Devils also have Belgian star Marouane Fellaini who has been handed a midfield role this season, when arguably he's much better further up the pitch.
And then there's Robin van Persie up top who just doesn't seem to fancy it at the moment. Despite all the words coming out of the Van Persie camp this past week, the Dutchman put in another subdued performance against Brendan Rodgers' side yesterday.
Moyes has a huge problem and hasn't been helping himself with the signings that he's made. In fact he's caused himself more problems and Manchester United appear weaker than ever.
Yesterday summed up just how far the Red Devils are behind their rivals. They lack a little bit of everything all over the pitch.
They don't seem to have the heart, desire or quality that was consistently at Old Trafford in the Sir Alex Ferguson era. But, it's pace they really miss. Whilst Liverpool had the likes of Raheem Sterling, Luis Suarez and Daniel Sturridge, United couldn't cope and didn't have an answer.
Rodgers' side appeared quicker, fitter and more powerful. They were always one step ahead of Moyes' side.
Vidic, who is off in the summer, looked slow and tired. As did the midfield pairing of Michael Carrick and Marouane Fellaini and Michael Carrick.
The only forward player that looked to have anything about him was Adnan Januzaj and even he had a day to forget... but at least he offered something.
It was only when he moved to the right wing that United looked like they would get anywhere near Liverpool's goal.
Rafael may be a complete liability – and should have been sent off - but at least he had something about him yesterday. He was prepared to run up and down all day long and injected some sort of pace in the United side.
In all honesty, the Brazilian was probably Manchester United's best player going forward, and he had a rotten afternoon. That says it all really.
The harsh reality is for David Moyes, is that if he can't change his system to accommodate his best players, then these so called best players will have to be sold.
The transfer market will be crucial for Moyes this summer, but his next on field system will eventually make or break his Manchester United career.
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