If it seems more washed out than what you expected, you might want to go back to the retailer and see if it does the same on the floor model. If it doesn't, then you may want to exchange your unit for another set. There's not really a way to adjust it. Adjusting some settings may help, but outside of that, I don't have any recommendations.
I recently purchased this at costco and overall the tv is great, looking straight on the picture is excellent, except that when you look at the tv from any other angle other than a 80-90 degree angle the picture seems wased out the colors are not vivid. Any suggestions as to how to fix the problem?