Apparently not. He is average offensively (so far this season) and well above average defensively.
That’s if we are only talking about the small sample of this season. He has been above average on offense the last 2 years and good on defense since last year.
We'd have to agree on who he's being compared with. If it's all "centers" in the league, including backups whose only skill is being tall, then yes. If it's centers who earn real minutes, then no, Ayton is not average offensively.
As for his defense, he's been very good at defensive rebounding, and I could see him winding up top-five in that category. And I know that the numbers say he has a low FG% allowed for the player he's defending. But he's not a rim protector and he's almost always too slow to be of any use as a help defender. So to me, that adds up to "above average" defensively, but not "well above average."
Offensively, he plays like a slightly more coordinated Dragan Bender, although Bender would sometimes attempt a dunk, so you'd have to give him the edge in aggression. Ayton may prove to be the superior three-point shooter, and maybe that's how he'll find a role in the offense. But right now, there is no place on the floor where he's a real threat, and a healthy percentage of the Suns' wasted offensive possessions are the ones where they pathetically try to force-feed him.
Over the two recent Sacramento games,
Ayton: 59 min, 20 pts, 27 reb, 5 fta, 1 blk
Holmes+Whiteside: 74 min, 33 pts, 30 reb, 11 fta, 5 blk
The Kings' pair had more minutes, and that's not Ayton's fault. But if you adjust for minutes played, they outplayed him in every facet of the game by a wide margin, except rebounding. And of course it was one win for each side, so that's a draw.
So either Ayton is mediocre, or Holmes and Whiteside are borderline elite. Take your pick.