These wouldn't happen to be from our resident Celtic ultra-pessimist would they? 
Pho Sita claimed we would win 30-45 games. He really went out on a ledge with that prediction. How does a team have a range of 30 wins or 45? That's quite the meaningless prediction.
How does a team have a range of 30-45 wins?
Well, for one thing, the prediction was made in June. So there's that.
For another, most teams heading into a season have a wide range of outcomes. If Isaiah blew out his knee in November, how many games would the Celtics have won the rest of the way? What if the chemistry didn't work out like it has?
To suggest that things like great chemistry, health, pretty good luck in close games, other teams struggling, etc were always a given is to engage in magical thinking.
The Celts have had, I think, something fairly close to a best case scenario this season. They are probably going to win more than 45 games, so even my best-case-scenario prediction was too low.
I was wrong.Still, given what we knew back in June, that range, though pretty wide, was a reflection of two conflicting things we had recently seen.
First, the Celts went on a great run toward the end of last season.
Second, they got smacked down by the Cavs in a convincing sweep in the first round (your words: "They looked bad against Cleveland in the playoffs").
Which was the better indicator of how the team would fare over the next 82 games? I couldn't tell you back then, and I'll wager you couldn't really tell me back then, either.
No, it's not very ballsy to make a prediction within a 15 win window (closer to the start of the season, I revised it and settled on 35-45 wins). But then, it's silly to try and make exact win-total predictions in June anyway. There are just too many variables.
It is hard to not notice those guys. However, after a while one can see their ideas are not much more than clutter. I'm sure they are great guys, but their basketball knowledge doesn't seem to match that.

Speaking of ballsy.
I'm sorry, who are you? What have you contributed to the discussion lately?
I've said this before, but I'll reiterate it -- as a general rule, I try to err on the side of skepticism with regard to the Celts, and I try to be more open-minded about what other teams have got going on. Why? Because the Celts are my favorite team, I watch them more than any other team, and it's easy to be biased in the other direction. And to be honest, the prevailing opinion around these parts tends to be to err on the side of optimism for the home team, and I find it much more interesting to challenge the widely held viewpoint instead of simply affirming it. I don't think these boards would be very interesting if everybody agreed with one another and was optimistic (or the opposite) all of the time.
For example, Celtics18 and I rarely fully agree on anything, because he takes the opposite tack most of the time. The forums are a better place because he posts here. Opposing viewpoints are good.