From the little I've been able to watch this season, I see 3 issues.
First and foremost is the lack of quickness on the blueline. This lack of quickness means gaps are larger, or if the gaps are tightened up, then the D gets beaten with speed. It also means more puck battles are lost since opposing forwards get to the puck first.
Second, the large rate of turnover among the forwards is causing a lot of issues in the defensive end. I still can't wrap my head around that T. Hall goal in Edmonton. Nearly every player on the ice for that goal had their head up their keister.
Third, the goaltending hasn't been what is needed. A lot of the "sins" of the skaters can be covered up by key saves at the right time. The Schneids and Brodeur have played relatively well. But, in this situation, relatively well isn't good enough. We need 'em to bail out the rest of the team. Hopefully, later in the season the skaters can bail out a sub-par performance from the men in pads. It's what good teams do.
The first 2 can definitely be laid at the feet of management and DeBoer. However, after 5 games (disregarding last season for now), I'm not ready to call for the coach's head. Having said that, I want to see a major roster shakeup for game 6 or, at the very least, game 7 if game 6 doesn't produce the desired result.
If game 8 comes and these issues still persist and no changes come from Pete or Lou...then I'll join the angry bandwagon.