Just for context...in his rookie year bradley shot 34%. Last year he shot 44%. I believe that smart can score in the nba. But he will need to learn to mix drives to the basket with open shots. He will never be Ray Allen, but if he can make open shots and drive to the basket he will be fine as a scorer.
Statistically, Bradley was a better shooter than Smart in college. It should not be surprising if a similar gulf exists between them when they both realize their full potential in the NBA.
Bradley was also a top shooter in high school before shooting .375 from the three as a teenager in his one year of college. Smart didn't crack 30% from the college 3 in either of his two years at that level.
Smart could become a good shooter over time or he might not. That's the risk of drafting someone without a shooter's record.
A good example of how a player with poor college stats can become a good shooter would be Kawhi Leonard. He shot 20.5% and 29.1% from three in two college seasons. He has made between 37.0% and 38.0% of his threes in all three of his NBA seasons.
I don't know if Leonard is a very good comparable for Smart.
Leonard shot relatively few threes compared to Smart. He shot just 164 across both seasons in college. He also shot 2PT shots at a very high efficiency (~50%) and was thought to have good shooting form. While 29.1% from 3PT land in his second year is not great, it was also notably a big improvement from the 20.5% of his first year -- indicating that he could show improvement in extending his range.
Smart shot 164 threes in his second year alone -- 295 total across both years. And his efficiency at the shot stayed static. That's the concerning thing. Especially given that his form has a couple of very noticeable problems that should be correctable. In particular his tendency to clamshell (bend forward at the waist).
Overall FG% is not necessarily a fair measure of a "shooter". Even if Smart remains a poor outside "shooter" he could get his FG% up significantly if he could drive to the rim more often. So far, we haven't seen much of that -- but it is only preseason.
Rondo is not much of a 3PT shooter, but has, for his career, been fairly efficient at getting the ball in the basket (career FG% of 47.5%, eFG% of 48.6%) through good shot selection. Smart hopefully will learn to do this as well.
But I agree that his history is concerning. Even back in college, Rondo posted an eFG% of 52.1%. Smart's eFG at OKC was 47.0%.
Basically, I'd like to see Smart going to the hoop more and not worry about hitting 3s so much.