Well yes, his results from 2013-2016 sucked ass and he should be blame, but WBWSF wants this roster constructed exactly as those teams were- a group of vets (Dunn, Eaton, Sale, Quintana, Danks) mixed with up and coming players (Abreu, Avi, Beckham), so it's hard for someone like WBWSF and Greg to say "he has stunk every year!" after he structured the team exactly how they wanted him to. What I'm trying to say is: it's surprising that those 2 posters are upset with his teams from 2013-2016.
You can absolutely blame him for 2017-2018, but again, they admitted to a rebuild. No matter the GM, last year's and this year's roster would suck.