In direct response to the title question: very good. He's only improved during his time here, and in 2019 (barring the LAL game, BBRef hasn't updated yet) he is averaging 26-8-5-2 on 55/41/85 shooting splits. Those are better numbers than those Rose put up in his MVP season, and they're comparable to Steph Curry's (less points on slightly worse - but still elite - efficiency, one less rebound, but better playmaking and defence).
The problem isn't Kyrie. It's mostly how our other guys have played. Lots of our guys have flaws that they haven't worked on.
Terry Rozier is a ball-stopping chucker. Tatum is a weak defender and passer. Brown is very inconsistent. Hayward is still not 100%. Baynes and Theis have both dealt with injuries and form slumps. Al has been on a minutes restriction due to injury.
There are many factors.