entertaining , if ultimately minor , thriller 
(ROOT (NP (ADJP (VBG entertaining) (, ,) (SBAR (IN if) (FRAG (ADJP (RB ultimately)) (ADJP (JJ minor)))) (, ,)) (NN thriller)))
(ROOT (NP (ADJP (VBG ) (, ) (SBAR (IN ) (FRAG (ADJP (RB )) (ADJP (JJ )))) (, )) (NN )))