There is nothing wrong with your set. That is the biggest problem with lcd sets.
More than 30 or 40 degrees off angle from the sweet spot ALL lcd's drop off on color and contrast. If you read the online reviews, they say that the led lcd's have an even worse dropoff than standard ccfl sets.I am not bashing lcd's, it is just inherent to the lcd design.
I may be purchasing one of these samsungs very soon and do not have to worry about sitting anywhere but the sweet spot
If you want wide viewing angles that all have the same color/contrast you have 3 choices..... crt, plasma, or front projection.