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 people insist or believe. Honestly, the movie isn't everything it's cracked up to be. Maybe I'm just not the right audience for it. She's supposed to be some expert litigator who can quash any legal case before it reaches trial; honestly, though, she's not everything she's cracked up to be.