Y'know those jagged edges/large squares you see when you're running a retro game on a large tv/monitor? They're the same thing, aliasing. If you're running a game at high enough resolution then they disappear, or you can apply expensive screen space/framebuffer anti-aliasing techniques to smooth them out, but they take post-processing/rendering power.
The Xbox360 version of our last game doesn't have them (as noticeable anyway) as the PS3 version because we could afford to crank up the Xbox360's anti-aliasing whereas on the PS3 we didn't have that option due to how close we were to our 60fps target and the X360s better hardware support for it.
cest la vie.
Andy
