Adding my two cents, it's pixelated on CBS badly too. All live sports are pixelated for me though. It doesn't look like this on other channels and shows.
CBS will depend on your local provider. Here in Minneapolis watching it OTA it is great. Nothing to complain about, at least considering the state of broadcast picture quality.
Sports will bring out more pixelation because there is more action and movement which puts more demands on the encoders.