No. You need calibrate your TV using a calibration disc. Unfortunately, your TV may not pass BTB in 1080p mode. So calibrating in 1080p mode may be difficult. I have a Panny DLP and 37PX60U, neither can pass BTB in 1080p mode. Works fine in 1080i.
The grainy and snowy is common for Plasma TV. It's not the fault of anything. Plasma TVs use dithering technique to display more shades than the panel can actual produce. This is often found in dark areas. If you watch TV in normal viewing distance, it is not noticeable if properly calibrated. Of course, if you watch it at very close distance, there is nothing you can do to avoid it.