It's tough to compare the 2011 squad to this one because they're so different. I will say both teams had personnel that fit and fully bought into the coach's system.
That 2011 team was mean and remarkably tough. A very hard team to play against. With the way the game is trending, I don't know that we'll ever see a team built like that acheive the same level of success. We saw how Claude and Chia's philosophy hasn't been able to sustain success as the game has evolved.
Don and Bruce have done a great job of replicating that team's drive, effort, and commitment to the system. The difference is their system is more effective in the modern NHL. They may not be as big in stature as the 2011 team, but I believe this team is just as big in heart, and in that regard, the spirit of the Big, Bad Bruins is very much still alive.