Smart is improving his shooting percentages. That's a good sign. Still a lot of games to go, he just needs to get consistently good. As long as he can space the floor, stay in that 36-40% 3 point rate, he will be a net positive for us considering his great defense.
Being far too unrealistic... 36-40% is slightly above average, and most shooters like Kyle Korver, Curry, Klay, Eric Gordon, maintain that 3pt percentage.... Not players like Marcus Smart.