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 experi…
The ordering also makes it more useful. Most restaurants in US just have a horrible HTML 1.0 menu with no ordering system, no pictures, and sometimes even goddamn frames.
With default Android it's like Home -> swipe -> camera -> 模式 -> 智慧鏡頭 and then point at the QR code while trying to tap the link that pops up as a tiny tooltip on the screen at the same time without making it go out of focus at the same time. It's awful.