Main problem I have with him is the number of snaps he got, which isn't his fault. We should be good enough that he doesn't have to play that many snaps.
He just shouldn't be on the field that much.
I agree with much of that... Just like Hayden ended up with too many snaps... But that's a factor of the both injuries and the system Marinelli uses. If a defensive lineman makes the game-day roster he's going to get snaps– There's no two-ways about it.
My take is he's he was a 40.7 rated guy per PFF last season– And even if you don't support the PFF grading system I think we can agree he wasn't very effective.
OK while you aren't going to replace him with an "80.0" performing defensive lineman... Maybe you can sign a 55.0 guy, who's a little better than Jack Crawford and won't break the bank. Incremental improvement is better than no improvement at all.
Here are Jack Crawford's grades per PFF...
2012 70.0
2013 47.8
2014 43.9
2015 39.4
2016 40.7
At this point he isn't even a young player.
Let the other five teams fight over him.