Shouldn't be anything wrong with that TV. I don't think it even has any controls which could make things look bad (mostly noise reduction in some models, which will blur fine, fast moving details). It's almost surely your cable company skimping on costs, and over-compressing the video signal to squeeze more channels in less space.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris