I really enjoyed "Speed Racer". Visually, it was stunning. The plot was pure melodrama (what else would you expect?), but it was paced very well, and had a plausible story with enough twists to keep you interested. I was worried that Spreidel and Chim-Chim would be annoying, but they were used in just the right amount as comic relief (there's a hilarious sight gag when they're in their pajamas) and were quite funny. Emile Hirsch was great and John Goodman (surprisingly) really nailed the Pops character.

I am not a Speed Racer or manga fan, but I recommend it (the commercials do not do justice to the movie).