As far as his game goes, he has proven to be solid against the run, a reliable tackler, and an effective pass rusher when asked. According to
Pro Football Focus (subscription required), they credited Campbell with 23 run stops, which is a run play that results in a “loss” for the offense. This was tied for the 24th most out of the 59 linebackers that qualified and was the same amount that Littleton had as well.
PFF would also record just seven missed tackles for Campbell which was the 10th fewest in the NFL of the 58 linebackers who played at least 50 percent of their team’s snaps. Not bad at all, especially considering how often he was around the ball with his 100 plus total tackles.
Campbell has also displayed positional versatility which is something that Mike Pettine will be a fan of. Of his 921 defensive snaps in 2019, over half were taken from the box, which is to be expected, but another 249 came from the defensive line. Additionally, 99 snaps came as either the slot corner, the out wide corner or as the free safety.
However, an area of his game where he can improve upon is in coverage. While Campbell moves well, this past season he allowed 58 receptions on 69 targets with an average of 10.6 yards per catch, along with four touchdowns and opposing quarterbacks had a passer rating of 110.9 when throwing his direction.
Ultimately, Campbell isn’t the player Cory Littleton is, but that shouldn’t be the expectation either.
https://dairylandexpress.com/2020/03/11/free-agent-lb-devondre-campbell-under-radar-option/
Sounds like a decent player, not going to be a ton of help in coverage but athletic, experienced, versatile and durable.