This debate still needs to season. When it came up last year it was dismissed out of hand because this group was unproven, never champs, etc.
When it came up after last season it was still pretty much dismissed: this group had trouble in the playoffs, no legendary players (Most Boston fans still, as much as they appreciate him, still don't quite realize what we've got in Garnett), only one title, etc.
Now it's still not quite taken seriously by most, but a few are starting to at least entertain the thought that it'd be a good series.
If the Cs lose this year and don't win any more titles, eventually this question will go away. But if this year's Cs win the title, and look distinctly better than last year along the way...it'll start getting more interesting. And if they just flat dominate, the way they have been, THEN the conversation gets more fun...