I just watched HDTV for the first time this weekend (football playoff games). Oh my gosh!!!!! I had no idea. Yes, much better than DVDs, and so much better than "regular" cable feeds. Once you've seen it, it's the only way to go.
I can't understand why adoption is so slow, except that you have to be close to a broadcasting antenna or have digital cable. And you have to have a decent tv. And there's not a lot of programming yet. And people have no idea what it is or what you need to buy to have it. Okay... I see why it's taking a while.