It's true that they can over-compress any format.
Don't hold your breath on the new satellites. The first 2 are slated for local channels only with some special programming mixed in. Not untill the last 2 sats in something like 2-3 years time will they add more HD programming. At least that's the current plan. If their approach to the local HD channels is like their approach to the regular locals, the quality will be low. I get a better picture on my 52" from an off-air antennae than I do from DirecTV. (on local channels)
My fear is that they will continue to over-compress ALL the channels, including HD, and keep cramming more channels into the same bandwidth.
I also suspect that my audio issues are the result of compression.
Guess you can tell I'm not a big DTV fan. HDTV seems a very low priority to them.