I'm a neutral and think he's a slightly better Klaassen (who I think is a tad bit underrated around here because he flopped at Everton). VDB is definitely capable of something, but unlikely to make waves at UTD (which I still can't say definitely, because he doesn't play).
He scored some important goals in that great Ajax side but was nowhere near being among the best players (Onana, De Ligt, De Jong, Ziyech, Tadic I rate more highly).
Ajax fans often rate all their "talents", even the clearly bang average ones like Kishna and Siem de Jong. It's part of the club's successful marketing.
@KirkDuyt doesn't rate him, but given that he's a Feyenoord fan, he's probably not the best judge of talent. He's looking at shite twice a week.