There weren't nearly as many important questions about the 2010 defense. The Packers had the ninth overall pick at DT coming into his second season, as much as people liked to down him, Hawk was a decent ILB in 2009/2010 (better than any ILB on the Packers current roster) and the Packers in 2010 were FAR better in the secondary coming into the season. The questions about the 2010 defense were about your third corner, backup DL and one starting LB (Bishop sort of came out of nowhere). Compare that to 2015 where the questions are about starting corner, backup corner, starting NT and BOTH ILBs.
In 2010 the team had a fairly decent dline (Cullen Jenkins and BJ Raji were playing well by the time the playoffs rolled around). Clay was awesome that year and people forget that Desmond Bishop was PHENOMENAL that year (Bishop had something like 14 tackles, 3 pressures and 8 stops in the NCF Championship and Super Bowl). Most importantly, the Packers had one of the best corner tandems in the NFL with Woodson and Williams and, oh yeah, a guy named Nick Collins at safety. The 2010 team had very good ILBs, strong interior dlinemen and awesome safeties. And Walden only played 180 snaps in 2010 so I'm not sure he mattered a whole bunch.
I'm not attacking your point, I know you said you weren't stating the defense would be good. I just think the 2010 comparison is not even close. The questions are MUCH more important this year than in 2010.
IMO that's way understating the questions there were behind the 2010 defense. Having an undrafted CB as your nickel is a major question mark going into the season. The depth behind him included Underwood, Pat Lee, and Bush. They were starting a 3rd round rookie (Burnett) at SS, and after he immediately went down they had to go with a journeyman backup in Peprah as the starter for the rest of the season.
We have Peppers now, they had no one starting on the opposite side of Matthews then. Those no ones were Brad Jones, Brady Poppinga, and Frank Zombo. They had to sign Erik Walden off the street later in the season. When Barnett went down, Bishop was forced into action with literally 1 previous career start under his belt. Sure, he turned out well, but he was still a complete unknown question mark as to how he would pan out long term.
They were decent on the D-line, but thinner than 2009 after the Jolly suspension. Raji was a beast that year, but many here believe based on recent reports that he can have that kind of resurgence this year. They were so depleted that they had to sign Howard Green off waivers from the Jets, who never played football again after that year.
Probably the biggest X-factor is that that team had Woodson, I grant you. Woodson was still near the top of his game. But that defense had equally as many, if not more question marks than we have right now. Based on the things I posted above, you could argue that they had at some point, question marks at every single position on defense. Maybe not before the season started, but certainly as it evolved -- and they were able to answer those questions. So I do have confidence despite the losses at CB that there is a plan in place to field a competitive defense this year and not simply go through a planned rebuild.