If you can get Love without losing any Nets picks and only one of the Smart/Bradley/Crowder trio, you almost have to do it. Love is still a very good player, one who's been underutilized in Cleveland and would fit much better here, both basketball wise and personality wise.
If you can make that trade and turn #3 into something like and Nurkic, were on to something.
If we put Love on this current Celtics team in Sully's place with no other changes I really think we're looking at a 55 win team and a trip to the ECF. He'd give us around 20/10/4 and would really help with out poor shooting. Buy low on him if you can, he's got another 3-5 years of high level play on the right team.