I play on ps3 have an LG 39LN5300 LED TV and have been recently tinkering with the picture settings.
These settings just don't look good. I just upgraded from a 39 tube tv, and these settings make it barely better than that old thing.
I'm no expert, but I'm guessing it is because different televisions require different settings to look its best. It's also due in big part to preference.
With sharpness at very low or off, the jagged edges are less profound, but that is because the image is more blurry and less detailed
My vertical and horizontal sharpness settings go to 50, and I settled around 18 to 20 to avoid obviously notable jaggedness. Any lower than 15 and the detail is lost.
Also, my picture looks much more clear and realistic with a high dynamic contrast. Without it, the picture appears washed out.
Low black level really helped the picture's clarity, while "off" or "high" washed out the colors.
It seems to me that all of the picture setting options, including a large number that you do not mention, must work in tandem to produce the best picture.
The thread did help me to experiment and research this more, and through trial and error I have found settings that I'm very happy with. So thanks for this thread.
*Edit: Sharpness at 15 is perfect for me. 20 brings out the jaggedness a bit too much.
Also, that tip about game brightness helped a lot. I didn't realize how much that would also impact the picture. I had ignored the ingame settings this entire time, lawls.