18th-best in NFL, according to Pro Football Focus:

Starting cornerback: Ronald Darby, 84.2 grade
Safety: Malcolm Jenkins, 84.1
Safety: Rodney McLeod, 79.4
Starting cornerback: Jalen Mills, 77.1
Nickel cornerback: Sidney Jones, 47.2

The loss of slot cornerback Patrick Robinson and the question marks his absence leaves cannot be understated. With all the draft picks in recent years at the corner position, no one besides Darby should be safe in their starting spot. The good news is that their is so much competition, the bad news is that none graded higher than Mills’ 77.1 overall grade a season ago:

https://www.profootballfocus.com/news/pro-nfl-secondary-rankings-all-32-teams-entering-2018