He is significantly better on defense so far this year... but worse offensively. In the short sample size available he's been a monster on defense. The difference in our team defense is staggering, we're giving up over 10 less points per 100 possessions when Ayton is on the court. Again... it is a small sample size, but we're giving up less points per possession when Ayton is in the game than the Bucks do as a team... with their league best defense.
I am very disappointed in his offense though, he is more in love with lazy jumpers than ever. Last year, despite not shooting many free throws, he was among the league leaders in true shooting percentage, so far this year his true shooting numbers are grotesque, well below even the average big.
I'm sure that, as he gets a more quantifiable amount of PT, we will see some regression to the norm on both ends of his stat sheet.
But so far at least, he is not the player he was last year, he is dramatically different.