First off, I'm still holding out for a miracle tonight. It looks bad, very bad. However, it looked very bad in 2004 too, and the Sox pulled it out. Unfortunately, the Sox only had to rely on a hurt Curt Schilling for one game. We need to rely on a hurt Rondo for 3.
That said, win or lose tonight, we should still be very proud of what this team accomplished the past 4 years.
First and foremost, we won a title. In the past 35 years of the NBA, only the Pistons, Bulls, Rockets, Spurs, and Lakers have done better than us, and only the Heat have matched us. While I'm very disappointed that we didn't win in '09 and '10 (and quite possibly this year) we still have done much better than most NBA teams have and a lot to be happy about.
Second, we've had the pleasure of seeing basketball played the Celtic Way and quite simply the right way. Just like the old days, no one cared about scoring, everyone played as a team, and the team played tough, gritty defense. In an NBA often dominated by self-obsessed ball-hogs who play matador defense, it's been an absolute joy to watch this team for the past 4 years.
As I said, I'm not waving the white flag yet: I'm holding out for the miracle. But win or lose tonight, the past 4 years have been darn successful and this team (and it's fans) have a lot to be proud about.