He's shooting it quite well, at the moment (46%). I expect that over the course of the season he'll regress to his average which is around 42-43%. That's not great.
As is to be expected he's already leading all Forwards with 6.3 FGA from 15-19' (and tied for first in the entire league with DeRozan). Yet, of all the forwards who shoot 3+ time from this distance there are 8 who shoot it with better accuracy.
This is who he is. As much as we all want him to play in the paint, he'll always be a league-leader in FGA from the least efficient spot on the floor. And there will be games where he hits them at a good clip, but he'll never be a league-leader in FG% from the range where most of his shots come from.