With LCD, you sometimes have to deal with the pixelization. With plasma, the environment matters. Distance from the screen, light level in the room, etc. LCD screens are still a relatively new technology, and the manufacturer's are still dealing with how to handle the picture if several of the diodes (pixels) are non-functional. This is a fairly normal occurrence.
If you have any mid-sized specialty retailers near you, you will get a better viewing experience than in a mass market store like BB or CC.
If you want, PM me with your general geographical area, and I can make some suggestions on where you can go and watch in a great setting.