First, let me say I am Chinese. I was born in Hong Kong, I lived closed to SF Chinatown for a long time, I cooked Chinese food on a daily basis. I know what Chinese foods are like.
PF Chang does not serve authentic Chinese food, but that does not mean it is bad. It is just different. Its dishes are a mix of Chinese, pan-Asian with a American twist. Here are the good things: the restaurant atmosphere is nice, formal but not overwhelming. It is a place where a company can host an interviewed candidate for dinner. The quality of the food is definitely good. The meat in PF Chang is definitely of better "cut" than that from a typical Chinese restaurant. The vegetables are fresh, but typical Chinese restaurants have fresh veggie as well.
The not-so-good things are: the price is relatively high for the quantity of food you get. Most dishes are not very bad, and they usually costs between $12-18. So a two person dinner can easily go up to about $50.
The cooking style is not exactly Chinese, but that is just different, and I don't count it against it. If you want authentic Chinese food, then you will disappointed, but if you go in with an opened mind and simply want to try something different, then I think you will enjoy it.