https://www.pro-football-reference.com/teams/gnb/2019_advanced.htm
But oooof it's amazing Martinez doesnt get thrown at every play looking at those stats
You have to be careful with those stats when it comes to LBs. They cover high percentage throws where there are few INT opportunities leading to high completion percentages against and high QB ratings against if they give up any TDs.
Martinez's coverage stats from this source are slightly better than Bobby Wagner's this season though opponents target Wagner less often:
https://www.pro-football-reference.com/players/W/WagnBo00.htm
Kuechley's numbers are better, particularly in yards per target while still giving up 69% completion rate.
https://www.pro-football-reference.com/players/K/KuecLu00.htm
Myles Jack, the #36 pick in Martinez's draft class, has good coverage numbers this season except for the 4 TDs surrendered which trashes his passer rating against:
https://www.pro-football-reference.com/players/J/JackMy00.htm
Consider the highly touted rookies, White and Bush:
https://www.pro-football-reference.com/players/W/WhitDe02.htm
https://www.pro-football-reference.com/players/B/BushDe01.htm
White had been injured and missed games so there's not much data, but on passer rating against basis there's not much to differentiate these guys from Martinez. Like Jack, Bush has nice numbers except his 4 TDs against are hurt his rating, not as much because he has two picks to go with it.
These comparisons are tricky business because you have to look at what the various schemes ask them to do, how those schemes might protect them, who is playing around them, and whether they get rotated out on certain plays. I'll leave it to somebody else to look at snap counts.
In fairness to Martinez, he's on the field for every snap, he's not protected or situationally substituted, he's the sole ILB on a high percentage of snaps in nickel or dime, and when he is paired with another ILB we've not gotten much quality play out of the position. Greene looked to be off to a good start all too briefly, Campbell might be an upgrade once he gets his sea legs.
I don't know how many 3-4 defenses there are, but if we say it's 50/50 with 4-3s, that gets you to 48 starting ILBs and theoretically 32 who are the primary coverage ILB who takes a lot of snaps with nickel/dime duty.
Martinez probably doesn't quite crack average in coverage, but given the scheme/all-snaps/pairings factors he's probably pretty close. My beef is primarily with his soft and late run D.