Lets put it simply.
Marcus Smart as a general rule is highly inconsistent. There is a very, very large disparity between Marcus Smart at his best, and Marcus Smart at his worst.
Unfortunately we tend to see "Marcus Smart at his worst" far more often then we see the other version. I would go so far as to say the ratio is something like 8:1.
HOWEVER fair is fair, and just like any other guy, Smart deserves credit when he has earned it. In the Playoffs so far he has been pretty darn good, and has without a doubt been one of our top 4 or 5 most consistent players over this series. Today in particular he was spectacular - Smart, Jerebko, Amir and Thomas were the clear MVP's of this game, and you could make a legitimate argument that Smart played the best of them all. Turner was pretty good too, but he made a lot of mistakes.
I am never afraid to call out a player when they play badly. It's only fair I give credit to a guy when he plays well too. Today Smart played one hell of a game, and he has earned some credit/respect from me throughout this series.
Lets also take not of the fact that Smart is still only 21 years old - he is a year younger than Buddy Hield.
I don't believe in jumping on the "youth" bandwagon the way a lot of people do, but when you have a guy who is giving you strong production in critical Playoff games at the age of 21, that's very promising to see.
The biggest thing with Smart today was IMHO the mental side. He didn't force so many bad shots, he drive to the basket with aggression and with the intention of scoring (rather than the hope of drawing a foul), and he maintained his composure emotionally better then he usually does - despite it being a pretty physical game.
Of course the fact that his shots were falling helped (as it always does) but learning to play with more discipline (as he did tonight) is the first big step towards Smart maturing as a playing and becoming a more consistent contributor. Credit to him for taking that step, if it's just for one game.