all sizzle and no steak

Noun

idiomatic uncountable

(idiomatic) A thing or person which fails to measure up to its description or advanced promotion.

Japanese Meaning

見かけ倒し：宣伝や評価に比して、実際の内容や実力が伴わないもの・人。 / 虚勢だけで中身がない：口先や華やかな見た目はあるが、実際の実績や質が伴わない状態を指す。

The product launch turned out to be all sizzle and no steak.

製品の発表は見せかけだけで中身が伴わなかった。

Sense（1）

(idiomatic) A thing or person which fails to measure up to its description or advanced promotion.

Her latest novel is all sizzle and no steak.