Regardless of the hefty amount of cliche and cartoon physics, Clockstoppers is an enjoyable spin on an old science fiction concept. There are no pretentious Speilbergian epiphanies or insights on a grand quantum design - just some simple adventurous fun, enjoyably above par special effects and several genuinely funny moments. Even the few spotty-acting moments are passable.
I'm not usually one to go for cute movies, but Clockstoppers has me. After enduring 'A.I.' and a string of badly executed, over-serious adaptations of several of my favorite Philip K. Dick stories, seeing something that's just fun was extremely refreshing.