I thought the movie was pretty funny, but if you let it decide anything for you, you should probably examine the way you treat people in your life. I like Maher, but he is definitely an asshole to most people in this movie. Here is how I felt like it went:

Maher asks interesting question with a valid concern
Interviewee answers question to the best of their ability
Maher humiliates interviewee in a disrespectful manner

Rinse, Repeat.

Funny movie but not as enlightening as I wanted it to be given the subject. I should know better than to expect too much from a comedian I suppose...

-Rob