Doncic has been good, no doubt, and better than I admittedly expected - I thought he would at least start out as okay, but unremarkable otherwise. But the hyperbole some of you are attaching to him is pretty absurd at this point. Any projections about his future impact are nothing more than idle speculation right now - just as they are for Ayton or anyone else from last year's draft.
Just to clarify some realities about him allegedly singlehandedly improving the Mavs last year, much of the improvement in their record came before they gutted the team in the Porzingis deal. They were 23-28 before dealing off Smith/Jordan/Matthews/Barnes, and 10-21 after the fire sale that pretty much left Doncic as the only useful player. And not coincidentally, Doncic's stats jumped quite a bit after that point - not surprisingly, since they were pretty much running the entire offense through him as the only viable option from then to the end of the season.
Additionally, the whole alleged improvement of the Mavs last season is also a matter of speculation as the 24 win season of 2017-18 has pretty much been universally recognized as a product of tanking that season to get a higher pick in that 2018 lottery - something that many teams (including the Suns) were actively doing that year, as many will recall. The Mavs had won 33 games the prior season with essentially the same core - likely indicating that their "big" 9 game improvement was more likely just a return to their normative status.
Doncic probably stands a reasonable chance of being an all-star type somewhere along the road in his career, assuming he stays the course and other factors don't interfere. Postulating him as some kind of all time great, HOFer, equaling or surpassing the games legends - at this point, is plain silly. Just as it would be with Ayton, Young or anyone else who is one season into their career at this point. For all we know, Ayton or Young (or even someone else) might end up eventually being the prize from this draft when all is said and done... or there is an even better chance that none of them end up amounting to anything all that historically memorable, as is generally what happens with the vast majority of NBA players, even when they get off to auspicious starts.
And I would still take Ayton over Doncic just based on the fact that if Ayton reaches the peak of his potential (a very BIG if, right now), he should easily surpass Doncic as an effective force. Granted, Doncic is light years ahead of Ayton on a mental scale right now, and that is a big part of achieving one's potential. But that is probably attributable to Doncic having played in a professional setting for years before he entered the league, and just the overall culture for young athletes in Europe vs. in the U.S..
