Before you jump on me, I'm asking about the greatest SEASON, not the greatest team...I think we all can agree that the 86 team at the very least was a better squad than this one.
But, given the 22 year drought and last year's 24-win debacle followed by the nightmare lottery draw, turning into a season like this one, I think an argument can be made. In the regular season, we won 66 games, the biggest turnaround in league history and one of the best records ever, and had statistically one of the greatest defenses in NBA history. We won our division by the biggest margin in NBA history, after not winning it for I believe 15 years straight. We also swept Texas, swept the Lakers, AND snapped the longest winning streak in 35 years.
The playoffs were even better: 2 Game 7s, one an epic blowout and the other an epic battle, followed by winning TWICE in Detroit when we finally lost homecourt. As icing on the cake, we got to expose a talented but soft and heartless Laker team with the whole world watching, racking up the biggest comeback in Finals history and the biggest blowout in a decisive game. We redeemed the careers of 3 Hall of Famers, and our guy Paul Pierce got to show the world what we always knew: he's not a single-handedly dominant player, but he's a championship caliber TEAM player in his own right. Not to mention Doc somehow got his hands on some coaching steroids along the way, and absolutely outclassed Phil freaking Jackson. We beat LeBron, completely embarrassed Kobe, and out-teamed the best all-around capital-T Team of the decade in Detroit. We lost 10 games but never trailed in a series. And by the end, we were clearly the best squad, and played like the embodiment of ubuntu in crushing our arch-rivals.
Put it to you this way - if someone had come to you in mid-August and shown you a screenshot of KG in a championship hat, with the text reading "Garnett: 26 points, 14 rebounds - Celtics defeat Lakers 131-92, win NBA championship 4-2 - Pierce named Finals MVP", wouldn't it sound like the best possible end to the ultimate dream season to you? What do you think? What other season could top this one? I'd love to hear some arguments on this.