I voted "Good", BUT...
There's literally no Free Agent out there that vaults us into legitimate contention sadly... (this next summer I mean)
Blake Griffin? Staying in LA. Gordon Hayward? Staying in Utah. Besides that you have to settle on the likes of Ibaka and Noel, who may improve this team but doesn't make us true contenders. Also would command a pretty large contract.
I see two legitimate needs for this team to become true contenders:
1.
A go-to scorer alongside IT - When teams contain Isaiah Thomas especially late in games, there needs to be someone else who can step up and score consistently on offense. Bradley occasionally has, but a smooth scorer would be nice, and Hayward could have been that guy sadly. Losing Bradley to injury last April in the playoffs against Atlanta hurt us a ton.
2.
A big who can score and rebound - Blake Griffin would have been ideal but he won't be available either. Unless you are perfectly fine with the likes of Zeller and Olynyk out there for rebounding.. then that's a BIG need, especially when facing good teams in the playoffs.
It looks like now we have to wait for Zizic next season.. or trade for Cousins OR one of Denver's bigs. Or settle for Ibaka/Noel. I think Ainge will do *something* this off season for sure here.@Fireworks_Boom, you pretty much identified the "needs" I listed though by putting "missing piece" under Center and Swings in your post.
Also, PLEASE NO TO MILLSAP. All Millsap does it make us the new Atlanta Hawks. Horford-Millsap were the duo in ATL, and then they would become the duo in Boston too, except you replace Jeff Teague with Isaiah Thomas in this scenario.
It could get ugly if Boston doesn't do much the next few seasons because then they are only a "middle of the pack". I'm sure we want to at least be a team that has a decent chance at beating GSW or CLE in a playoff series (right now we aren't.. but maybe in a year or two?).