I think the different experiences comes down to socioeconomic status - my impression comes from Chinese expats, in particular international students. This demographic is best summed up in a single word: "over-privileged"
These are the direct beneficiaries of the current regime, and I even personally knew a couple whose parents were unabashedly in the bribery business. They all tow the party line something fierce... scary, especially since they're "destined" to be the Chinese leaders of tomorrow :S
I'm glad to hear that "normal" Chinese aren't nearly as bad as the ones I've met. This gives me hope.
About the poison milk/bribery stuff though: even the people I know don't agree with these things, and are more than willing to admit the government's failure in preventing these things. However, if you dare bring up Western-style agricultural/industrial policies as a means to mitigate this sort of thing, you are in for some major hostility. This may be unique to the demographic I talk to, but basically only they are allowed to criticize the Chinese government - if you represent some kind of western ideology you're frowned upon.