"Transformers: Dark of the Moon" exceeds the low expectations set by the previous outing, "Revenge of the Fallen," if only by a whisker. Both films serve primarily to make the first "Transformers" look like a classic. All three, taken together, which they should never be, appear designed to make your children more addled, volatile -- and, most dangerously, to make them less discerning consumers of summertime junk. Bay's hammering technique works, in a commercial sense. Executive producer Steven Spielberg is the richer for it. But it's telling to compare any good minute in Spielberg's "War of the Worlds," for example, with any of the 153 minutes in "Dark of the Moon." The former, which isn't even Spielberg at his best, offers the thrill and the uneasy, complicated spectacle of destruction you get from a first-rate entertainer. Bay's endless love of nastiness and chrome and aggression offers less. And that's the only "less" about it.