has not been satisfactory之疑問?

has not been satisfactory (present perfect tense/ 現在完成式)
~ 一段時期(一直)還沒達到標準, 暗示未令人滿意, 不排除現在開始會令人滿意
~ 比較客觀/ 有禮的表達
Grammar/ Usage: something (e.g. Your performance) has not been satisfactory

is not satisfied (present tense/ 現在式)
現在令人不滿意
~ 比較主觀/ 個人/ 直接的表達
Grammar/ Usage: some one (e.g. I/ He/ She/ They) am/ is/ are not satisfied