This movie was the first half of the Grindhouse double feature. It was directed by Robert Rodriguez, who directed Sin City, among others.
The movie was about a bio-weapon that accidentally gets released and it turns the infected into zombies. The uninfected have to fight the zombies, with plenty of gore for everyone.
This movie was fun to watch, but definitely not thought-provoking. Sometimes entertainment is just entertainment. And, that's fine by me.