I have been told by friends in the industry that most Samsung LCD's are delivered with "store demo mode" still enabled.
In this mode, the TV picture will revert after 20 minutes to a horrible bright setting that looks good only in a warehouse, regardless of the current settings you might have enabled after visting avsforum.
It is tricky to find the magic menu sequence to turn off "store demo", so check your manual.
With old fashioned Comcast analog serivce, making a coax connection right to the LCD from the wall, my Samsung looked great, once I used avsforum settings and turned off "store demo".
Sure it looks better now that I converted to Comcast digital, got the moto stb, and hooked it up via hdmi (tuned to an HD station) ... but it looked damn fine with coax.
Also -- there are ambient lighting and other reasons to prefer LCD over plasma in some situations. This stuff is well known, why the controversy?