Nope, MU is not full of star players but they are full of overvalued players. They are not star players, since the beginning of this season I dont see that they have star players. Who are the players that you think are star players? Pogba?Ibrahimovic?Rooney?Mata?Rashford?who? Do they show that they are star players? I'm a fan of MU, for me they are just a team that full of sh*t players atm.
Edit : the only star player in MU is De Hea IMHO
Most of them were stars before join Man United, so its not fully their mistake if they playing bad. No offense, but how long you become Man United fan? I have no idea when you say Rooney is not a star for Man United. His performance maybe is not as great as few seasons ago, but he has been a part of history for Man United even English football. About Ibrahimovic, he has won every league he played. Mata? He is one of the best Man United players in few last season.