He is, and he will likely only get better. I still have an issue with trading Doncic for him - I guess I sort of get. The gamble was likely that Young was going to be Buddy Hield bad to average his first year, possibly two - he was pretty frail until - honestly, it feels like the all-star break and now, he can suddenly take a hit and still get his shot off. And then Young was going to be all-star good by Year 3. In the interim, they get two more lottery picks.
I do think Doncic needs to get in better shape as he gets older. I imagine he will. He looks like he is playing 20 pounds heavier than he should (Ditto for Towns btw). Could be a trade that ends up working for both teams equally well.
I will point out that three years ago I mentioned that Buddy Hield was a top 3 pick and it looked like I was an idiot even two years later - not as stupid as Kings mgmt who traded Boogie for him, but still, pretty stupid. Dude is balling this year.