It's all relative, though, right?
It seems like defense has dropped off a cliff all across MLB, since I was a kid. That being said, the Sox have been below average more times than not in recent years. However, the last 20 years, fangraphs has us ranked 11th. DRS 11th. UZR/150 4th!
Perhaps surprisingly, since 2019 (5 years,) we look to be maybe 18th to 24th, if you average 4 numbers (I don't count Flg%.)
11th UZR/150
20th DRS
21st fangraphs
28th Flg%
30th OAA