How anyone can say that Smart is a poor ballhandler and bad decision-maker with the ball...I mean, you're kidding us, right? This is a joke, yes?
I will reiterate - if you disagree, then you obviously are not watching him with an open / objective mind.
Go back. Watch game one. Watch it objectively.
Smart made a lot of very costly errors. A couple of possessions where he over-dribbled and held the ball too long (Rondo style) only to eventually lose his dribble - he was very lucky that one of those occasions the ball hit the defender's foot an was called a kick ball, and on the other occasion I believe a Celtics player ended up getting the loose ball and saving his butt - and so they managed to luckily avoid a turnover Probably the reason why people choose to ignore it.
Another play where Smart had a wide open three. Chose not to take it. Instead tried to get closer by dribbling directly into multiple defenders - I believe that play led to a lost ball, a lucky recovery by another Boston player, who was then forced to take an unplanned shot that missed, and the opponent got the ball.
Another play Smart brought the ball up on offence, had one or two defenders right in front of him. Before the offence even had a chance to initiate anything, he pulled up for three with two defenders nearby, and obviously missed the shot. Opponent got the rebound.
Two other plays later in the game (second half, from memory) Smart caught the ball and fired up contested threes when there was still plenty of time on the shot clock. Lucky for him he made both shots - but they were poor decisions and he should not have taken them, regardless of whether they went in or not.
Another possession (cant remember if this was Game 1 or Game 3) he was inbounding the ball, Rozier was driving, and Smart through a bad pass behind Rozier and out of bounds - turnover. I believe that Chicago scored on the next possession too.
Another possession Smart made an incredibly dangerous pass into the paint to Al Horford. There were three defenders in the path of the ball, and by pure luck the ball went between those defenders, and Horford managed (barely) to catch the ball and put it in. A dangerous pass that Smart should not have made, but he got off because Horford saved his butt by making a heroic catch and finish.
On another play I believe he through a very dangerous cross court pass from one side of the court, past multiple defenders, to the other side of the court. Almost got picked off - somehow by fluke it got to a Boston player's hands.
A couple of ill advised fouls that were completely unecessary.
Multiple possessions where he was stopping the ball - standing around dribbling the ball aimlessly for way too long, with no apparent goal or action in mind.
As I said, watch the game objectively, count the number of poor decisions Smart makes. You won't be able to count them on one hand. You'll struggle to count them on two hands. On at least half of them he got bailed out by teammates, lazy opponents, or by sheer luck.
You can to ignore all of these mistakes if you so choose, but it's doing the Celtics no favours when everybody gets on the Smart hype train and ignores all of the major mistakes he makes on a consistent basis.