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You may ask: "How on earth can Wayne Rooney be considered a disappointment?"
Rooney was the horse that David Moyes bet his mortgage and house on. And now the bank have repossessed the property.
Of course, it is vital that we highlight his statistical contribution to United this season:
The 28-year-old captain-in-waiting hit 19 goals in 38 Premier League and European matches, providing an impressive 15 assists along the way, per WhoScored.com.
It is easy to argue that without Rooney the end result of seventh in the league, and a Champions League quarterfinal, could have been a lot worse.
But Rooney was the problem that Moyes and many United fans did not anticipate.
Once again, pre-season was all about whether Rooney would stay at United, and the emotional energy invested by Moyes to keep his boy wonder was clear.
However, Moyes got his tricky kid to stay and everyone in Red rejoiced.
But Moyes also clearly planned to build his side around the Merseysider's talents and it backfired, even with a squad who know how to make Rooney tick intricately.
Despite Rooney's figures, the insistence on making him the celestial body of the team contributed toward United's downfall in 2014.
Sir Alex Ferguson read the situation correctly, and he took the emphasis off Rooney and on to players who eventually won him his 13th league championship.
But Moyes switched Fergie's recent philosophy and as a result failed to qualify for Europe.
Rooney is not a bad player. He is a very good one. But he is not world class. Robin van Persie is a world-class striker and Juan Mata is a world-class No. 10—Wayne sits somewhere just behind this.
He is a company director rather than chairman of the board and Moyes promoted him above the station that suits him.
At 28 years old, Rooney still has a very average first touch and until he improves that (and at his age he probably will not) he cannot be the creative central figure in a team like United.
He needs to be part of a stellar supporting cast and this way United's strength in depth can shine.
Rooney is not a skipper and he is not a leader. But he can contribute heavily to the reemergence of Manchester United as a force in English football.
If he is not happy, not being top dog, in the coming years then maybe it is time for both parties to hug and say their goodbyes.
No one player is bigger than Manchester United. This is a fact Wayne Rooney should heed.