It was good news all over the place for Nintendo in this month’s NPD report. But, one game in particular got a special mention. NPD’s report barely includes sales of Luigi’s Mansion 3, which release on Halloween. However, the small amount of time it had is all it needed. Luigi’s Mansion 3 was not only the best-selling Switch game for October, but it managed to have the best debut month for any Luigi’s Mansion game in the franchise’s history, including the original.
NPD: The debut month of Luigi’s Mansion 3 has become the best in the franchise’s history

So Nintendo take note and make LM4 immediately.
So, it’s the best in a franchise that spans only three games.