I am running xbox 360 game on a 1024x768 resolution plasma tv...some levels on the inside appear to need anti aliasing...like really jagged especially when there is lighting.

The game I am running is Red Faction Armageddon. Will the results be better if I switch to a TV with 1366x768.

Why is this happening? Is this game specific?
Is it because of the rescaling from 720p to 1024x768 thats causing the problem?