I have a Sony 40", not a cheap one (there are massive differences in features and quality between and cheap £400 LCD and a £1500 one at the end of the day), had it 2 years now, it is perfect, not a sign of any clouding whatsoever, or bleeding or blurring. My set was from the joint Sony/Samsung factory, although recently I believe samsung have also purchased sonys part.
My dad has an lg, it has clouding, but my Sony has none whatsoever, neither did my Samsung before it.
I've thought about replacing my set with a Samsung 3d, they thing holding me back is that I have a perfect set with no 3d, if I spend a lot of money, I might get a set with issues just to get 3d, it's pot luck as to whether you get any clouding or not, I was lucky, mine has none, that's because not all sets suffer from it, yes the manufacturers will say you can get it, as they want to cover themselves for when people do have it so they don't have to keep changing out sets until the customer gets one without the condition.
It was exactly the same with laptops and dead or fixed colour pixels, yes it can happen on TFT screens, doesnt happen to all, just some, and they will only change the product ,if out of the box it has a certain number in a row or in a cluster.
We had customers in comet buying 2k laptops and they had dead pixels out of the box, nothing we could do, we wouldn't change it as the manufacturer states that as part of the manufacturing process you can get dead pixels, doesn't mean all screens will have it.
The blacks on my screen also couldn't be better, ive been extremely impressed, which is why I havent upgraded, even though I want 3d, I don't want to compromise a perfect set and picture in every other aspect.