I disagree, the LB core is mediocre when you consider the amount of work and attention put into the positionI dunno - the track record at LB is fairly decent:
Rk Year Rnd Pick Pos DrAge From To AP1 PB St CarAV G GS Int Sk College/Univ 1 2017 1 30 T.J. Watt OLB 22 2017 2017 0 0 1 7 15 15 1 7.0 Wisconsin College Stats 2 2017 7 248 Keion Adams OLB 22 0 0 0 West. Michigan College Stats 3 2016 6 220 Travis Feeney OLB 23 0 0 0 Washington College Stats 4 2016 7 246 Tyler Matakevich OLB 23 2016 2017 0 0 0 2 31 0 Temple College Stats 5 2015 1 22 Bud Dupree OLB 22 2015 2017 0 0 1 12 38 24 14.5 Kentucky College Stats 6 2014 1 15 Ryan Shazier LB 22 2014 2017 0 2 3 27 46 41 7 7.0 Ohio St. College Stats 7 2014 6 192 Jordan Zumwalt LB 22 2014 2014 0 0 0 0 0 UCLA College Stats 8 2013 1 17 Jarvis Jones LB 23 2013 2016 0 0 2 18 50 35 2 6.0 Georgia College Stats 9 2013 6 206 Vince Williams LB 23 2013 2017 0 0 2 19 79 33 1 10.5 Florida St. College Stats 10 2012 3 86 Sean Spence LB 22 2012 2017 0 0 1 12 53 23 6.0 Miami (FL) College Stats 11 2011 5 162 Chris Carter LB 22 2011 2017 0 0 0 6 75 4 Fresno St. College Stats 12 2010 5 166 Stevenson Sylvester LB 22 2010 2014 0 0 0 5 50 2 Utah College Stats
That's everyone from 2009-2017. Some nothing guys in the 5th and 6tth round. Not going to hold that against any NFL team at any position. At that point you are expecting to be choosing between special teams and depth players.
Spence busted out because of injury. Totally off-set by the massive win that is Vince Willliams. Shazier is a tragic win. Jones is a bust. Dupree is a league average OLB with a bit of upside remaining. Watt is a seeming win.
I keep hearing how there are all these LB draft picks the Steelers "missed" on. It is one. One guy.