I really like the first trade, because it does two key things at once: saves money and helps clear the logjam at SG.
I also like the second trade; removing Bass thins the clogged PF spot, and I think Sully and Olynyk need to be given as many minutes as possible, since they project to be a bigger part of the team's future. I also like getting a big, legit backup center in Haywood, even if he is a bit old.
Regarding the third trade, I wouldn't mind shipping out Fab, but then again, maybe I'm being a bit hasty with him. Maybe another season in Maine would make Melo NBA-ready for next season, and Boston should be fine this season with a 4/5 rotation of Sully, Humphries, KO, Faverani, Iverson, maybe Haywood or someone like him, and even a bit of Green at the 4. I also would like to give Lee further opportunity, because if he can fulfill his potential, he could be another solid piece going forward with his shooting and defense at the 2.