I consider "tough to play against" to mean a lot of different things, and many of them are not being tough physically.
A group that works hard every single shift is tough to play against
A group that is relentless on the puck is tough to play against
A group that "never says die" is tough to play against
A group that bends, but never breaks is tough to play against.
A group that stays completely disciplined and dedicated to a game plan is tough to play against.
All of those things were true of the Rangers, at different levels from 2011-12 through 2014-15, the balance of them dependent on the moment you're looking at.
If we can get back to those things, through better players than we've had the last few years, then I don't care how the coach gets there. Quinn certainly sounds like he's much more "Commander Riker" than "Captain Picard" in his style. By the way, I don't simply mean skill when I say better players. It's not a coincidence that this team lost something with the departures of Richards, MSL and Hagelin. All three of those guys sort of embody the 5 things I laid out above.
It will be interesting to see if we can get back to it.