ㄇㄧㄥˊㄅㄨˋㄈㄨˊˊmíngbùfúshí

名不符实
  1. 名稱名聲內在事實相符虛名名不副實」、名不當實」。 藥品廣告多半誇張療效名不符實」。

the name does not correspond to reality (idiom)​; it doesn't live up to its reputation