HDDVD was an inferior product, and DRM isn't about the media, you can encode DRM in/on anything. That is like saying you don't like the new bridge because of the graffiti on it. Not sure how you can say Bluray is more expensive, it is cheap now, way more than HDDVD ever was. It was more expensive at first because it was more advanced.
Agreed, Sony home audio is not the best quality, but it is what it is, at it's price point.