Just on the level of sheer spectacle -- and these are movies we're talking about, spectacle is no small matter -- a flick like "Jack the Giant Slayer" has a lot going for it: a perilous daylong climb into the clouds, acastleinthe sky worthy of Hayao Miyazaki, waterfalls that drain into thin air and the delightful sight of a 100-foot chef sneezing into his pastries.