Is it brand new?
How many hours (rough guess) do you have on it?
How did you break it in?
It seems as though you may be seeing streaking and blotching. We are aware of this. I wouldn't be too concerned, as it does disipate over time. Not to mention, the overall PQ (believe this or not) gets better after the first 500hrs!
You will notice that overall uniformity becomes parallel, and the blacks become richer.
Just give the panel some time. I am sure you have some sort of 30 day return on it, yes? If so, give it the 30 days. If you don't see any improvement, return, and get yourself another one.
Either way, congratulations on purchasing the best flat panel in the business.
I hope you have a nice surround sound system to go with it