It was a great idea, but I think I need to make some points about the things that I found unsatisfactory.

unsatisfactory 是由前缀 un-（表示"不"）加上 satisfactory（令人满意的）构成的形容词。satisfactory 来自动词 satisfy（使满意）加上后缀 -ory（表示"与...有关的"）。整个词的意思是"不令人满意的"。