A year ago NHL.com listed this as our top-10 prospects:
Nylander
Percy
Gauthier
Brown
Finn
Johnson
Loov
Leivo
Bibeau
Nilsson
Is that a perfect list? Not really, but lets go from there. I would say that Brown, Johnson, and Bibeau trended upward, while Percy, Finn, and Leivo had their stocks drop somewhat. So if we're just ranking those guys it'd look something like Nylander-Brown-Johnson-Gauthier-Loov-Percy-Finn-Bibeau-Nilsson-Leivo. You could make the case too that Carter Verhaeghe deserves to be there too, or at least he'd be very close.
Then we obviously added a decent amount of guys who deserve consideration. Marner and Kapanen for sure. Leipsic, Harrington, Bailey, Hyman. If I had to start ranking guys, I'd be more comfortable doing it in tiers like this:
Nylander
Marner
Kapanen
Brown
Johnson
Leipsic
Gauthier
Harrington
Bracco
Dermott
Loov
Percy
Leivo
Nilsson
Finn
Bailey
Hyman
Soshnikov
Verhaeghe
Valiev
And that just happens to be 20 players so I'll stop there. Some of the other guys from this draft like Lindgren, Timashov, and Korostelev deserve consideration here too, but maybe it's a little too early to start throwing their names out. I'd probably put their potential over some older guys like Leivo/Bailey/Hyman but they don't have the experience yet of course.
Then there's a handful of NCAA guys from before this draft like Cameranesi, Toninato, Joshua, Piccinich, and Vesey that I have no idea how I'd rank. They're all long-shots really but maybe we get one NHLer out of the bunch, who knows.