Meaningless comparison. The rosters are entirely different.
1) No they're not; the key pieces are largely the same; and
2) It's perspective, not a prediction. The same people saying the team is doomed this year were saying it last year, and in the latter part of 2010. Maybe they're right, but history says that's not necessarily so.
The problem is last season our best players were pretty abysmal during the first half of the season. They started playing better and we started winning.
This season, our best players have played great.
That said, this severe recent doom and gloom has come as a consequence of our last 3 games. In those 3 games, Pierce hasn't played well (though he recovered in the 2nd half against Sacramento). Also, comparing to the 2nd half of last season when we took off, Pierce has been playing worse and less efficient by a good margin.
Rondo has been awful or missing games because of injuries in those 3 games too.
So while overall I would say Rondo has been out-performing what he did last year (though he has been tasked with a bigger role this year, and still hasn't lived up to it in my opinion). KG has been completely awesome, and Pierce has been under-performing, though he has mixed it up with some very good peformance, but largely up and down with a step slower defensively.
So no, I wouldn't say our best players have played "great".
KG has been great, but he plays limited minutes. Rondo has been very good, but I'd say not living up to the role he was asked to play so far.
And of course, no Bradley, and Ray Allen was very good early in the season, then deteriorated.