there are plenty of films out there with DD 1.0 soundtracks on HD-DVD
DD is 5.1, there is no 1.0 DD. Do not mistake Dolby Digital with Dolby. Check out your receiver display and see for yourself. If you see just once Dolby Digital and less than 6 channels lit I'll pay you or anyone else million dollars.
it's not like the DD 5.1 coming from Comcast on any channel actually comes close to DVD bitrates for 5.1 tracks, so ruling out somehting because it is 2.0 on comcast might not be the best reason not to watch something you otherwise would. i understand not wanting to pay for it but the difference between 2.0 matrixed to surround and 5.1 on comcast might not be that huge.
This is another crap like Sdurani posted before claiming that PL II is better than Dolby Digital. Difference between Dolby Digital and anything else with less than 6 channels is like day and night. You have to be deaf not to hear it. I watch regularly movies on cable and very well know the difference. If movie is not DD then I don't even bother to turn receiver on, I just use TV speakers. Audio rate on cable is exactly as is supposed to be. You have probably mistaken audio rate for HD video rate that some addressed recently. How good audio you get is how good your cable connection is so if you have any problems then call your cable guy to fix it. I don't have any problems right now.