Why does my xbox look worse in HDMI on my hdtv than on my monitor with VGA?

The computer monitor will look better because the Pixels are smaller. You samsung only support 720p, not 1080p. So it's just the TV. I have a Samsung LN55B750 and it rocks, its not as sharp as my 21inch sony monitor. Next time you get an HDTV, try to get one that support 1080p. Computer monitor will always look better, but your trading it off for a larger screen.