Xbox really can't compare to the PC, in any way really.
Even running Kotor (which was made for xbox in the first place) it's still sluggish and a jaggy mess compared to the PC version (which I might mention, got an unoptimized port).
Out of the three top consoles atm, Xbox is the worse. Even thought it does have the second best hardware... It's still lacking. Considering the lousy selection of games and the horrible controls.