Mourinho won the League Cup and Europa League as United manager.
But Young told Sky Sports: "I think everyone was really excited about Jose coming in. When you see what he did in his career you thought this is an appointment that could have happened years prior to when it did.
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"I say a little disappointing, as to what was to come.
"You knew Jose from the Chelsea days and then he went to Real and then he's come back and you see the style of football that's being played.
"I don't think it was a style of football that suited the Manchester United way."
He added: 'Yeah of course players always talk and even then us as players we could have taken it on a bit more."