People everywhere, bad drivers, lots of arrogance etc, but now looking back there many great moments that I kind of miss.
One of them is that I loved travelling and exploring in the US. There is just always something to do. Also you meet nice people almost everywhere. So it was quite easy to make friends instantly.
If the visa situation wasn't so bad, I think I'd go back now that I took a break from the Bay Area Craziness.
To me living in Europe makes more sense (more stable and secure), but life in the US is somehow more fun. That is until you run out of money (be it because of medical bills or because you got sued...)