Late to the party, but as a former American resident, a few points caught my eye -
Someone said that American culture is often characterised by excessive materialism, and I'd have to agree with that wholeheartedly. Once you pick away at superficial sociability, it's all down to possessions.
Someone said that American citizenship was something to be proud of - I just have to say "barf". How can you be proud of something you have no control over (that's if you are a natural-born American)? I was totally put off any kind of patriotism post 9-11 with the disgusting behaviour I witnessed in the US.
Someone talked about American websites not slagging off British. Erm - news for you, ladies. If you look at websites for American expatriates in the UK, you will find plenty of active threads doing exactly that, including theads specifically about parenting. How backward we are, how anything in the US is better etc. I tried to do my bit for Britain on one of the sites and was banned for having such sensible views.