I have a top rated Panasonic TH-50PZ800U and sometimes I notice a difference in quality too, but not nearly as bad as you describe. For instance, with Sunday Ticket, some weeks the HD quality is mind blowing and other weeks I notice slight picture problems relative to the mind blowing quality the prior week. I never thought it was D* or the television, but the source, and simply that some programs are recorded with higher quality HD equipment than others. If HD NET records in 1080 and ESPN in 720, then I would expect HD NET to have a better picture, and they always seem to. I suspect some of the Sunday Ticket games are in 1080 and others in 720 too, which accounts for the quality differences I see from week to week. I could be entirely wrong about that but I'm guessing not.