not all, everything, etc. somebody/something is cracked up to be
not everything (someone or something) is cracked up to be
Not as good, enjoyable, impressive, or worthwhile as someone or something is reputed or said to be. Honestly, the movie isn't everything it's cracked up to be. Maybe I'm just not the right audience for it. Everyone thinks she's this expert litigator who can quash any legal case before it reaches trial, but she's not everything she's cracked up to be.