I agree that there was a preparation issue leading to our loss in the Playoffs (A page out of Belicheck's book might have been useful here to prepare for the emphasis on stacking WRs!)
I also have reflected on this season and realize that our biggest issue was consistency. I never trusted our O line all season and am glad that we adjusted not to constantly rely on 6 second pass routes in the second half. Our defense was good but I don't think they were ever feared by other teams. I think, more so, other teams were just surprised that we played as well as we did in certain games (Cowboys).
Maybe this loss is just what we need to get to the Super Bowl next year as coaches and player try to get that consistent polish on our talented team.
The first principle is that you must not fool yourself, and you are the easiest person to fool - R. Feynman