Even though I understand (and feel) the frustration when we haven't managed to trade for the players we want to be contenders, I think we are on the right track. From the point where Green and Rondo went as it had become obvious the rebuild wasn't going to work around them, we haven't taken a backward step. Nearly every new player has contributed, the pics have mostly looked promising though not world beaters and the team is playing well with a winning system and coach who is getting more from his players than many imagined.
This is the NBA and nobody expects our present squad to be able to compete with the top echelon of teams and especially over a 7 game playoff series. After last seasons effort the team may feel the pressure to make the playoffs as expectations are that the squad will do at least as well as last season. Though I expect the team will do a little better this is not a given and any number of things could result in this group 'underachieving'. This wouldn't be good but not the end of the world.
IT is here and happy and I think one of our pieces in place. This season will show us more about Smart and how far he can go. I would rather go into the market for a big name after we know more about that. With a crowded roster this season should clear up who is here for the long haul. Amir and Lee have a chance to prolong their careers by making a go of things in Boston. Neither is locked in long term and if either is a success, both parties have benefited. So, even if results don't go our way this season (god forbid), I think the rebuild is still going in the right direction.
Patience is the way to go and get the right player when they become available. I would love for us to do well and pick up two players mid season but I think that is about the best case scenario. The following season might be when the Celtics become contenders again.