I'd say halo mcc was the biggest disappointment but that's just me. I agree tho that destiny is a bit of a letdown. I was expecting the "greatest game ever!" Hype to live up and it was being made by the "legendary" bungie developers. I was on the train since day one when they showed it, I still play it maybe once a month but it had soooooo much potential. I still think and hope it can still be salvaged but changes will need to be made.