You can use Mastercard and Visa in many high end ish places like Starbucks, upscale shopping centers (like Cocopark in Shenzhen), nice restaurants. Virtually all ATMs also support these cards.
Thanks. I will try more mainstream places. I found that even in some brands I still have to use my China Construction Bank debit card. I never had a problem getting out cash with my Visa debit card from an ATM. I just couldn't use the debit card at a lot of stores.