HAS NOT LIVED UP TO THE HYPE

HAS NOT LIVED UP TO THE HYPE = not as good as you thought it would be.

e.g.

Dominique Rodgers-Cromartie should have been great for Asomugha's development as a player, but so far he has not lived up to the hype.

http://bleacherreport.com/articles/899438-tim-tebow-and-the-nfls-5-most-overhyped-players