Mark Twain is credited with popularizing the saying that there are lies, damn lies and statistics.
And certainly, you can use statistics to make a case one way or another that the 2018 Steelers had a good defense or one decidedly average.
The Steelers finished the 2018 season sixth in the NFL in total yards allowed. They led the NFL in sacks for the second consecutive season and were ninth in third-down percentage. They were 10th in passing yards allowed and had the league's sixth-best run defense.
On the other side of the coin, they were tied for 16th in points allowed and red zone defense.