Bring back menus, QR codes are terrible

As a counterpoint, QR code menus work very well in China. I've been to places where you scan the code to open a menu that lets you place all your orders. You can also pay for your table via per table QR codes.

As a side note, you don't customarily tip in restaurants in China, so a non high-end place with good food will typically have rushed and curt wait staff. Ordering through the phone will give you a better experience!

Unless you are a visiting foreigner without cell phone service and the WiFi requires you to login with a working cell phone number, then you are in 没办法 territory.