I have no interest in watching this documentary - I think it's been over-hyped.
verb - overhype
= to make exaggerated claims about (a product, idea, or event); publicize or promote excessively.
Useful expressions:
to live up to the hype = to meet/fulfill your expectations
'I hope this new album/film/diet/book is as good as people are saying and lives up to the hype.'
Also:
This film is overrated = valued or rated too highly
This film is underrated = not valued or rated highly enough.
Give an example of a film/TV programme/book etc that you think is overrated, underrated or doesn't live up to the hype.