Korchinski has sky-high potential. Adam Fox can be a nightmare in his own end. Same with Hughes and Makar, and Heiskanen was turnover happy this season, especially against Calgary. You take those warts if the playmaking, stickhandling, skating, and IQ is already at an elite level.
Fox isn't even a good skater, and even with his defensive shortcomings, he still won a Norris and leads defensemen in playoff scoring.
Korchinski deserves to be top-5 and should put up major points no matter which team drafts him. Nemec, Jiricek, Mintyukov, and Korchinski are in the elite tier IMO and my next group of Odelius, Chesley, Mateychuk, Grudinin, Koromyslov, Bischel, Havelid, Duda isn't too far off (with Lindgren, Luneau, Salomonsson, Casey not too far back of them). Then you have the high risk/high reward types like Hutson, Pickering, Lamoureaux, George, Nelson etc.
This draft is loaded with playmakers from the back end -- that's one of many reasons why you can't call it weak or average. If your team ignores defense this draft, regardless of what the pool looks like, the scouting director should get his head checked.