Meaning of “not all it's cracked up to be” - Learner’s Dictionary

not all it's cracked up to be

( also not as good as it's cracked up to be) INFORMAL

not as good as people think or say:

Being an actor isn't all it's cracked up to be.

(Definition of “not all it's cracked up to be” from the Cambridge Learner’s Dictionary © Cambridge University Press)