like a medium-grade network sitcom -- mostly inoffensive , fitfully amusing , but ultimately so weightless that a decent draft in the auditorium might blow it off the screen . 
(ROOT (PP (IN like) (NP (NP (DT a) (NML (JJ medium) (HYPH -) (NN grade)) (NN network) (NN sitcom)) (, --) (ADJP (ADJP (RB mostly) (JJ inoffensive)) (, ,) (ADJP (RB fitfully) (JJ amusing)) (, ,) (CC but) (ADJP (RB ultimately) (RB so) (JJ weightless) (SBAR (IN that) (S (NP (NP (DT a) (JJ decent) (NN draft)) (PP (IN in) (NP (DT the) (NN auditorium)))) (VP (MD might) (VP (VB blow) (NP (PRP it)) (PP (IN off) (NP (DT the) (NN screen)))))))))) (. .)))
(ROOT (PP (IN ) (NP (NP (DT ) (NML (JJ ) (HYPH ) (NN )) (NN ) (NN )) (, ) (ADJP (ADJP (RB ) (JJ )) (, ) (ADJP (RB ) (JJ )) (, ) (CC ) (ADJP (RB ) (RB ) (JJ ) (SBAR (IN ) (S (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (DT ) (NN )))) (VP (MD ) (VP (VB ) (NP (PRP )) (PP (IN ) (NP (DT ) (NN )))))))))) (. )))