I was entertained throughout out, but movie left too many questions. No back story on the grabber I feel was a big mistep on the directors part. Feel like pages were ripped out of a book, and we will never get the full story.
Spoiler ahead
But toward the end when Finn knocks off his mask the grabber completely gives up and losses it. Why does he do this? What do the mask mean, does he have multiple personalities? All these questions we will never have answered.