Other than hire Trestman, what has Emery done that is so bad? He has drafted two perennial pro bowlers in the last 3 drafts in Kyle Long and Alshon Jeffery. Drafted solid contributors in Jordan Mills, Ego Ferguson, Will Sutton and Jon Bostic. He has a possible future pro bowl CB in Kyle Fuller.
He brought in Brandon Marshall, Jermon Bushrod, Matt Slauson, Martellus Bennett, Willie Young and Jay Ratliff who have all been a big part of this team.
When he came in, he immediately fixed the offense. By the time he finished doing that though, the defense that was already old got ancient. Urlacher, Briggs, Tillman and Peppers were either retiring, declining or leaving and Angelo drafted so poorly that we had NOBODY to step up and replace any of these guys.
This team's decline was inevitable with the decline of those star defensive players. Combine that with Tucker and Trestman's inability to coach and Cutler's boneheadedness and you have a recipe for disaster.