Let me start by saying that I am keeping an open mind about China and would perhaps like to visit there again some day to see more of the country. We only experienced a very tiny part of China - just Shanghai and Hangzhou. That's like coming to the United States, visiting NYC and Trenton, NJ for three days, and then forming an opinion about how much you love or hate America.
With all that being said, I think this might be the first place that I've traveled on vacation that I really didn't like and just couldn't wait to leave (Shanghai, at least).
The city of Shanghai itself is fine. It's a lot like New York City - very crowded, huge metropolitan area, financial and business hub for the country, gateway for travel, etc. And there were some interesting and pretty sights to see in Shanghai.
What really turned us off were some of the cultural differences. The constant hacking and spitting and shoving and belching and nose picking and staring and conning and deception and general rudeness of the people was a difficult transition for us, especially since we had just spent weeks in some of the friendliest places I've ever visited.
One part that we did enjoy was a day trip to Hangzhou. We took the fast train from Shanghai to Hangzhou and spent the day walking around the famous West Lake, which was really beautiful.
Hangzhou was also the only place we met anyone who seemed genuinely interested in being friendly (exclusive of the various con artists!). We happened to walk into what they call "English Corner," which is an area near West Lake where, for the past thirty years, Chinese people gather on Sundays to practice speaking English. They were excited to see a couple of Westerners and we chatted with the folks there for probably an hour before continuing along our walk. The guys we talked to were really friendly and smart (one guy was getting waaaaaay too deep into some philosophy theories for my tastes. I couldn't keep up!). And I also learned from him that being an accountant in China means you are good at cooking the books (OMG).
Perhaps it was road weariness or homesickness, but Buddy and I were both glad to leave Shanghai and head back to the States. Maybe we will go back one day under different circumstances and really enjoy it, who knows.
As a parting gift of sorts, when we were in the Shanghai airport waiting for our flight to leave, a Chinese guy walked over and intentionally launched a snot rocket right next to me. I am very grateful for Clorox wipes and hand sanitizer!