On paper this team should have landed a top 5 pick last year and looks like it should land a top 5 pick this year.
Normally, I would spend 10 mins to write an argumentative reply.
But at this stage, I feel this is a far more appropriate reaction.

Haha TP
Eh...
I strongly believe Danny expected this team to be bottom 5 last year. Think about it... you take a 26 win team and remove the two best players (Rondo and Jeff Green). Yes, adding IT off our bench was helpful. Yes, we landed a couple unwanted bench players like Zeller and Crowder. But on paper, there's no way Danny Ainge expected this team to win 40 games last year. He very clearly intended for this to be a lotto team. And judging by the fact that he attempted to give up #16 + up to 5 more draft picks just to move up to #9, he wasn't too pleased about the result of the season. BUt it's ok.. cuz our little playoff appearance will help us recruit free agents, right? Oh wait...
Sorry, I lost my train of thought for a second.
SO yeah, on paper, this definitely looked like a bottom 5 team last year. With a couple weeks left in the season (11 games), we were essentially tied with the Hornets for the 9th worst record in the league. We went on a run during extended garbage time. Charlotte fell apart. They ended up picking 9th, we ended up picking 16th.
I credit the success to Brad Stevens. He's a basketball McGyver. He could win 40 games with a paperclip and duct tape.
The addition of David Lee and the swap of Amir for Bass should boost our talent level a bit, but on paper I think you'd be hard pressed to find many teams with less talent than the 2015-16 Celtics. If this ranking is based on what we look like on paper, #28 is defensible. But I can't imagine Brad winning less than 30 games with this team. I could see us winning as much as 45 if we're lucky. Brad's the type of guy who can make edible cheese from cat milk.
But is anyone confident that we could have replaced Brad Stevens with some random coach like Steve Clifford and still won 40 games last season? I sure don't think so. I'm not even sold that the success of last season can be replicated this year. When you have a team that lacks talent, you need to rely on execution. Consistent execution requires confidence and focus. That's a hard thing to maintain if you hit a string of losses and players get frustrated.