Idiom for 'smth that's not good anymore'

Is there an expression that means 'something that used to be good/popular isn't good any more'? I dont think that 'Ain't all is cracked up to be' fits as it implies something isn't good NOW (and what people say about it)

I.e. this game used to be good/popular. Many people played it. But it's not as good these days.

Or, the actor used to be great when he was younger. He's not that great any more.