Well, that’s disappointing

A deflated reaction to a small letdown.

Source dimensions: 480 × 342 encoded pixels · 10 fps · 1.6 seconds
What it expresses: An ordinary hope is followed by an anticlimax or missed opportunity.
Example: An ordinary hope is followed by an anticlimax or missed opportunity.
When not to use it: Severe loss, sincere grief, or a triumphant outcome.