I watched District B13 the other day, and as long as you don't make the mistake of bringing your higher reasoning functions along, it delivers - David Belle and Cyril Rafaelli do their own stunts (and holy crap are they impressive), stuff gets shot and occasionally explodes, and generally a good time is had.
The most dangerous part of the package is the theme that goes over the opening crawl. It could be the worst earworm ever. Bone-dry filtered industrial hip-hop beats are catchy, but you can't even hum them. It's like an itch you can't scratch.
Edit: Oh, and it gets worse.