No, I've had two DVD players, both outputting at the same resolution - 1080i - that are perfect.
I've tried the MyHD on my Sony HS10, and two Plasmas - a Hitach and Panasonic and it does exactly the same thing on those. Infact its worse on the Plasmas because it leaves a thin black border on the left hand side.
I've tried enabling and disabling the Digital Panel option on the MyHD to no avail.
Its a shame because other than that the DVI output is excellent.