SD HD flat screen performance

[DaveWM]

I was wandering around wally world yesterday, no more CRTsets they said the last were gone last Christmas. I was checking out the pic on the flat screen, looked great in HD but lousy in SD. Is that normal?

I have no intention of getting a flat screen, I guess my eye sight just is not that great, but was suprised by how BAD some of them looked (again SD).

I also noticed that if you got off to the side the colors seemed odd.