Not to defend China on human rights here, but to those accusing China of hypocrisy: China does this to point out the hypocrisy of the US - who is too happy to accuse others of human rights abuses while running turning a blind eye to its own problems (for some modern examples, see the latest NDAA or the patriot act). The economist actually had blog about this just recently: http://www.economist.com/blogs/analects/2012/05/americas-exa...
I don't think anyone in Chinese government expects the world to take them seriously on human rights. They're just trying to deflect criticism.