It's a reflection of Kyrie's exceptional talent that you say "isn't" here. He and (previously) IT both saw improvement in efficiency as they became the central focus of their team's offense - I would think the norm would be for a player to be less efficient when that happens. Some of this, I would guess, is that as great a player as he is, Lebron isn't nearly that good a coach.He is having his most efficient season shooting (2pt % and eFG) which isn't a total shock given that he is now the main scorer for his team.
As the team and Kyrie have figured things out offensively, both their and his defense has fallen off, and we've seen a couple of games where Kyrie coming out has led to some defensive stops. I'm thinking the critics were right to identify defense as a weakness, but that he is still a solid upgrade over IT.However his defense has seen a huge improvement - he is averaging the most steals per game of his career, features his lowest D-Rating (I know that stat has lots of problems) and his BPM is the highest of his career, bolstered by a marginally negative DBPM.