Average CGI can look really bad in HD. And some people find HD pictures a bit distracting when they first start watching them because they keep noticing inconsequential details like blades of grass or something happening in the background. It will pass after the novelty wears off.
Pixelation (or macro-blocking) usually has nothing to do with hardware. It has to do with a crappy, over compressed signal and too much motion happening onscreen. Its very apparent with streaming services and cable and satellite "HD" content. Try a blu-ray or a really well encoded DVD on an up-converting player and you will see how good your picture can look.
I have this weird sensation watching hd channels on my Samsung 32", 1080p, 120hz - LN32B640 (that i purchased 2 days ago) that many of the objects in the foreground are not part of the background. It's like when you watch a bad movie that uses a green screen for the background, and you can clearly tell that the people are not part of it. Well that's what this looks like. I'm not sure what's causing this, HD in general, Samsung brand, LCD TVs in general or what but I am having trouble believing in what I'm watching because it looks like actors walking around on a set. I am already having trouble with pixelation, so I might just return my Samsung for a Sony to see if I still have this exerience.
Does this make sense to anyone?