I saw the film on Monday of the first weekend. It is one of the funniest movies I have ever seen. I can't stand South Park, but they got it with this one.
Without giving anything away, no-one is unscathed by the humor. True, there is stereo-typing galore, but that goes for America too. Reviews have covered this, so I don;t feel restricted. The team destroys a number of international landmarks, without batting an eye. That kind of attitude is pretty common in the US, "...we got the bad guys, don't complain about how we did it." I can't say I like it or agree with it, but it is pretty accurate, as far as stereo-typing goes.
The bottom line here is to be able to laugh at yourself, and take it all with a grain of salt.
Do not take your kids. The R rating is quite accurate. My kids were very disappointed. They understand why they can't see it, but they are still upset, being that they like South Park. If you are easily offended by course humor, or racial or national stereo-typing, don't go. Whatever you believe, remember this is a film made in America, following American ideals. Basically, free speech. I do not believe the creators were espousing any kind of kill'em all concept. They saw irony and an opportunity to lampoon, and they ran with it...all the way.