Paul Pogba arrived for a world-record fee, while Henrikh Mkhitaryan and Eric Bailly have shown flashes that they will prove to be crucial United stars.
Zlatan Ibrahimovic has been an instant hit with his 28 goals in all competitions, including the winning goal against Southampton in the EFL Cup final in February.
Rio Ferdinand is disappointed by Man United's past transfer business
Jose Mourinho admitted in the week that Man United should not have sold Javier Hernandez
But United's next top scorer in the Premier League is Juan Mata with just six goals.
And Ferdinand believes selling the likes of Javier Hernandez and Danny Welbeck have cost United dearly.
"I just look at the team and I just think it is so disappointing," Ferdinand told Sport360.
Man United's £250m summer wish list Tue, April 11, 2017
Express Sport takes a look at five superstar players Manchester United are reportedly keen on signing
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Romelu Lukaku (Everton) – £65m
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United sold Danny Welbeck to Arsenal in 2014
"You could have Chicharito [Javier Hernandez, who’s now at Bayer Leverkusen], Danny Welbeck [now at Arsenal] and Rashford.
"Could you imagine? As a defender, I am sitting here thinking ‘there is no rest’."