I was rewatching the time of the angels and the bit at the begining with the angel on the video photage and it got me thinking angel is a statue in a major city full of CCTV cameras, speed cameras, mobile phone cameras, tourist cameras and even just reflecting surfaces. How many times in the course of a single day would any given angel be caught on camera especially if it were perched on a monument like a church, how many images, how many new angel holograms sneaking in through people's eyes . . . ?
To me, this was a brilliant escalation of the Weeping Angels. I was enthralled by the idea that "whatever holds the image of an angel becomes an angel." You can't blink at them... and now, you can't stare at them! There's a lot in this high-concept conceit, I think, a lot that could be explored in further storytelling. (It's an idea that's been explored in other Doctor Who stories, too. See Big Finish's "The Red Lady.") It takes a particular kind of story to do the concept justice, however. Admittedly, as you and others have noted here, it's a concept that falls apart without the right setting or set-up.
I'm not a fan of the power escalation but the look them in the eye and you let them into your head I can live with as it does fit reasonably well with the show. The one I choke on is that they can use a partial and buggy video recording to create a holographic projection to attack people with.