I know everyone shits on PFF and I'm sure it's a flawed metric, but it's one of the only ones available to grade OL outside of "eyeballing it" and Beachum was ranked above average last year. While that doesn't mean he's pretty good and it's not debatable, it does mean that it's fairly likely he wasn't terrible.
Of course the Jets had a historically disappointing season in the run game being horrendous allover the OL, the backs themselves, and the playcalling.
That said he did get a vet minimum one year contract, so that's also a pretty fair reflection of his performance as well.
