If you're going to talk about the results data, then you might as well provide more summaries than aggregate 'who spanked who the hardest', as the war crimes France and the ABs were committing were certainly not par for the course.
Below are summaries of the pool stage results by pool, tier, and pool + tier. Note, tier 1 is RC + 6N teams. Tear 2 is everyone else.
Largest points differentials are in pools A + B. Would dare say that France and New Zealand are currently the best teams for piling on points, while Italy imploded against both of them.
Pool B, of course, had Ireland, South Africa, and Scotland in a battle for two spots.
@LeCheese talked about the importance of context, and this is likely most important in Pool B where the three Tier 1 teams were aiming to run up points - and were all able to do so. The AB's were also theoretically in danger of being eliminated by PD, but that only lasted one match (vs. Namibia). Tier 1 vs. Tier 2 is much more modest on the other side of the draw.
EDIT: More has been posted in the time it took me to make this but cbf editing anything.