For now, the benchmark seasons look like 2008-2010 and 2021, with the 3 prior worst records being 2009, 2008, and 2021. The 2020 Nats finished 4 games ahead of this team through 60 games. By win percentage:
2009 - .364 (59-103)
2008 - .366 (59-102)
2022 - .377 (23-38) - in progress 2021 - .401 (65-97)
2010 - .426 (69-93) (niiiiice!) (also, flip of the 2019 record)
2020 - .433 (26-34)