It depends on where you are and what you order.
I live in California. We definitely have Americanized chinese food here, but we can also easily get authentic tasting:
- dim sum of various types
- mapo tofu
- kungpao/gongbao chicken
- twice cooked pork
- scallion pancakes
- Peking duck
- noodles of various types
The list could go on.
I’ve also had some mind-blowingly good Cantonese food in NYC and Philly.