No, it makes perfect sense. When talking about "graphics" then that is what counts, and no excuses for less visually impressive games based on necessary compromises for scale and openness will fly. On the same note, I wouldn't give a visually impressive but narrow game a pass when discussing impressive accomplishments in openness and scale. Save that for straight up tech discussions.
About scale, though... why is this still used to describe Halo? I don't recall participating in all that many large scale battles in Reach. The game does a good job in making it feel large, but I honestly don't remember a moment where it was all out war.