I took a break after the way things ended. Looking back, I don't think the Lions really overachieved. I think the Lions did what we expected them to do in the regular season -- win the NFC North. And if we had been told that our playoff opponents would be the Rams and the Buccaneers (rather than the Rams and the Cowboys or Eagles), I think most of us would have expected them to win playoff games against those teams.
If they overachieved anywhere, it was in the first half of the SF game. They caught the home team flat-footed and raced out to an early lead. Some of this was aggressive coaching, some of it was converting on several 3rd and longs to keep drives alive. In the second half, the talent deficit caught up with them, and the game ended the way pretty much all of us expected it would, and the way we would have expected at the start of the season.
The fact that the NFC Championship game was as close as it was is a testament to Holmes's incredible drafting and Campbell's incredible coaching. Next season every player on that roster will show up to training camp expecting to play in the Super Bowl, and it will be a perfectly reasonable expectation.