"Promised to be exciting, but ended being boring" [duplicate]

Although it promised to be exciting, it ended being boring/dull/useless.

Any idiom for the above phrase?

Solution 1:

It ended not with a bang but a whimper. (a slight adaptation of T S Eliot's famous stanza).

Solution 2:

There are probably a slew of idioms for this. The first few I thought of were these:

It fizzled out.
It petered out.
It ended with a fizzle. [Not sure that this is really an idiom, but it's close.]
It was a dud.
It bombed. (def 2)

Solution 3:

A single word suffices.

underwhelming

is a quasi-non-standard neologism since the 1970's. It was originally created as a snarky backformation for the other dierection from 'overwhelming', but it has since become accepted. For example,

It was a wasted evening at the symphony. The premier of the wunderkind's latest piano concerto was underwhelming.

Solution 4:

If you're referring to something not living up to the hype, you could say:

All Sizzle, No Steak.

It failed to deliver.