sequelitis

Noun

derogatory informal uncountable

(informal, derogatory) The tendency of a well-received work to spawn many inferior sequels.

Japanese Meaning

大ヒット作品が、その成功を受けて低品質な続編を多数生み出す傾向を指す（軽蔑的な表現） / 成功した作品が続編展開に走り、結果として質の劣る続編が連発する現象

Many fans criticized the franchise for suffering from sequelitis after each new installment felt more disappointing than the last.

多くのファンは、新作が毎回前作より期待外れに感じられるため、そのフランチャイズが多数の質の低い続編を量産する傾向に陥っていると批判した。

Sense（1）

(informal, derogatory) The tendency of a well-received work to spawn many inferior sequels.

For an exhilarating period, until spectacle and sequelitis restored formula to the throne, experimentation became big box-office.