Criticizing Spiderman3 for having "not much story" sounds pretty funny coming from a guy who thinks Hayden Christensen has the gravitas to play a young Darth Vader, and whose single greatest contribution to modern film thought - in the twenty years between Jedi and Episode 1 at least - was overestimating fanboys' desire to snuggle up to a jive-talking Sesame Street reject. And of course, writing the prequels himself in stilted, Shakespeare-lite prattle.
What Lucas meant to say, though he never will say, is that writers don't matter. Or he's still under the illusion that he is himself a talented screenwriter. Either way, I weep for what should have been a defining movie moment for the current generation of young folks. Let's face it: the prequels (as a literary object, at least) were a total failure.