When flush-mounted speakers are done right, it is just fantastic. Nothing can touch them. The problem is that most room designers don't REALLY understand monitors and how to properly integrate them, and they come out badly. It is an expensive, ballsy thing to experiment with someone's room buildout money, and even moreso to take on the challenge and expense of their monitoring as well. Given how few big rooms get built, it is easy to see how few have really ventured into doing the whole package with a big enough budget to do it all right. Hence, a lot of bad rooms that don't really do justice to the idea.
