After giving Iron Man a pass, critics generally seem to have knives out for Speed Racer, despite the fact that Speed boasts the most radical visual strategies seen in a movie theater since Sin City, and maybe longer. Yes, of course “unconventional” is not equivalent to “excellent” or even “interesting,” and I guess I can understand why you might not want to let the Wachowskis play your optic nerve like a Jew’s harp for more than two hours in a sitting. But, man, if you value a little razzle with your dazzle, this one delivers a lot more of that stuff than, say, Iron Man.