If you're not going to use a third-party approach, TiVo or Cable Card for HTPC with extender, you're probably not going to adjust to Comcast's equipment.
I can adjust to anything. The only reason I am considering Comcast at all is their TV comes for free with my internet for the next two years. Otherwise, i was considering no pay TV at all.
After a night of watching Comcast and switching between Sat and Cable sources, Comcast's audio comes across as "muddy" (my wife's words, to boot). Some channels look overly sharpened, and I did notice some motion artifacts I don't get on DirecTV.