1

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

Any idiom for the above phrase?

3

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

  • Though not an idiom, Shakespeare's immortal words come to mind: "[Life] is a tale/ Told by an idiot, full of sound and fury/ /Signifying nothing." – rhetorician Mar 1 '13 at 17:13
  • TS couldn't hold a candle to WS. – Edwin Ashworth Mar 2 '13 at 11:26
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)

  • All sort of fireworks (or not-fireworks). Damp squib falls into that category too. – Andrew Leach Mar 1 '13 at 15:28
1

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.

1

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

All Sizzle, No Steak.

or

It failed to deliver.

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