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I've tried loads of QR readers too. None of them ever work.
I've used several and most are a pain to try and hold still while you snap the picture and then blur it as you push the button.
Try this popular app: "Shop Savvy" free in the app store for iphone and I also have it on my Droid.
This one has a red line that you line up and when it comes into focus it automatically snaps the pic.
It also does QR codes (those square little matrix maps) I just used it during lunch as I snapped one in the USA Today and it pulled up all there articles in that days paper . . . cool! Oh ya, as another poster has said, snap the pic in good light.