I'm very pleased that my Cinematical colleague James Rocchi both enjoyed Speed Racer and published his review before mine, and here's why: I couldn't wait for the damn thing to end. This garish, aimless film wore out its welcome (and its crayon box) after about 25 minutes, but the cinematic eyesore just kept lumbering on for two full hours. I know it's tough to keep kids still in a movie theater even when they like the movie they're watching, so I can only imagine what parents will be dealing with as Speed Racer's merciless stretches of blah-blah-blah hit the screen. Aside from three or four mega-flashy racing sequences, Speed Racer feels like the pilot episode of a Fox TV series called The Generic Family from Plastic World.
A young man named "Speed Racer" grows up to become a hot-shot car racer (imagine that), but when he refuses to sign with an evil tycoon, it kick-starts a third-act conflict that can only be solved by ... car racing! There's the whole of your plot in a nutshell, but I've left out the resoundingly clumsy flashback structure, the nominally interesting but ultimately pointless side characters, and several absurdly "emotional" moments that might have made an impact if they didn't occur on sets made entirely of bright pink styrofoam and glitter. There's also an allegedly mysterious character called Racer X, a button-cute and entirely superfluous girlfriend character, and (wedged in clumsily whenever things get dull) a mischievous little kid and his monkey sidekick.
Or you could just go see Iron Man again.