Really depends on where you project guys to go. I mean, players picked in the 20 to 30 range only become a somewhat valuable core piece (a top 9 forward, top 4 defender, or a starting goalie) like 35% of the time, but most people think its a lock to get a piece like that and think there's a better chance to get a Pastrnak or Boeser than there actually is.
Due to this, when looking at who will underachieve there draft slot, you really have to look at the top of the draft to call someone a sizable disappointment. Boqvist scares me. He probably has the widest disparity between floor and ceiling of any high pick. Factor in he's a defender who hasn't played significantly at levels above J-20 it adds a whole bunch of risk. Very similar to Cale Makar, although, I would say Makar had even more risk attached (late birthday while Boqvist is among the youngest in the draft) and very limited IIHF experience, whereas Boqvist has been at big events and played big minutes there.
I think the wingers are the safest position to draft. Yeah, you get Yakupov's occasionally, but I find they are the easiest to project, and have the easiest transition at the NHL level. While one or two may disappoint, I have a hard time not seeing Wahlstrom, Svechnikov, Zadina or Tkachuk being top 9 NHLers with obviously a much higher ceiling.