Comcast HDTV customer? You’re not getting anything close to what you’re paying for.
(Click here for a printable version.)
While many customers have a variety of issues with Comcast, I think their most egregious failure to deliver customer value mostly boils down to downright rotten picture quality.
What does “High Definition” really mean? At the barest minimum it means “better than standard definition,” also known as SDTV. It would also be reasonable to insist that it look better than enhanced definition, also known as EDTV. What you get from Comcast does not look consistently better than either SDTV or EDTV, as I demonstrate below.

Comcast "High Definition" Isn't:
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