Pros....he's a free agent. Could leave with no compensation except taking his salary off the books.
Might get a decent pick or player or salary cap relief
Not a great shooter, certainly not from the line
The Boston media will benefit from not having a player around who gives short terse answers that illuminates that they just asked a stupid question....then again they fawn over Bill Belichik who does this at all times.
Cons....lose the best passing pg in the game
Lose the best rebounding pg in the game
Lose a good pg defender
Lose a player that attracts other free agents.
Lose a very intelligent player
Lose a player who signed a very fair contract last time out.
Marcus Smart is mostly just an injury prone "point guard" who can't shoot either