QR codes are a tool. It isn't the fault of the hammer that sometimes they are used to kill people. Likewise it isn't the fault of QR codes that many times they are used for something that isn't useful (at least they can't kill). When I'm at a museum I love the ability to scan a QR code and get a lot of detailed information that wouldn't fit on a sign - but often I just want the small sign and then I move on to the next exhibit.

a great combination is a short summary with a QR code for more info if you want it. It doesn't have to be rocket surgery.