I don't want to say that the QR Codes were a fad, but they're just not used a ton these days. I've seen them used on resturant menus, and heck I even had a set of busienss cards made with my information inside the QR code so it could be imported to a phone.
Probably the biggest downfall with the QR Code system is that there's multiple types, and in order to read it, you have to download an app. And if you want the contact data imported to your phone, you need to download a paid app (or the import works like crap).
That being said, they're great for things like a Bus Stop where a user can click the QR Code and instantly find out the bus route (links directly to a site/page), but the true power of the QR Code really hasn't ever been unleashed. If it's a coupon or a link to a special place, you're losing many of your audience that doesn't have a QR Reader installed, so you pretty much have to have the QR Code & a regular link or contact info below.
At least that's been my experience with it. As for QR Codes in Comercials, I hate them. It's a 30 second comercial, and it takes me 10 seconds to find my phone, a few more to load the app to read the qr code, and then by the time I'm focused on the screen and lining up the box correctly, the commercial is over. Seems like the wrong medium for QR Codes.