It is not primarily the fault of the HDTV with the exception of motion blur. The primary reason why you are seeing pixelation is due to real-time video compression that is necessary to reduce the size of the video stream so that it will not over-saturate the limited bandwidth of broadband.
I'm not sure how much bandwith is necessary for uncompressed 1080p video, but I would not be surprised if it was 1GB per minute. Therefore it is necessary to do real-time compression since broadband is nowhere near that speed.
The problem with real-time compression is if there is a lot of movement on the screen, like when the camera is panning, then you will have a lot of "noise". Everything is moving and I assume they use a constant bit rate when compressing. That results in a lot of pixelation and motion blur as well.
If you want any sports game to look like a blu-ray movie, then your gonna be very disppointed 'cause that's not going to happen.
I'm not expecting "any sports game to look like a blu-ray movie", but I do expect a picture superior to my old 480i CRT. Not all of the models had these problems. The Samsung 530, 630, and an LG(I didn't look at the model) did have these problems. And the LN46C630 is a consumer reports recommended LCD TV, and that was model I was paying attention to when this happened. I've heard so MANY
times that you could see the blades of grass(referring to a football game). I expected a lot more for a $1000 TV.