Based entirely off watching the game today and no more, I think he's the best prospect on the 17's, and it might be by a lot.
I think he's been compared to Jack Hughes before. I don't think thats a bad comparison. I would say though that he's more of a combination of Hughes and Zegras. He's about Hughes level in overall impact he has on a game, but he's more Zegras style of hockey player. The full ice vision and his ability to make such difficult passes is like Zegras. Skates at a Zegras level, better shooter than a Hughes, so similar to a Zegras. He's probably also closer to Zegras physically/defensively. Needs time, but he'll probably get there. He's already as tall as Hughes or maybe taller. If you wanted, you could say he's a better Zegras, but I don't see the very creative plays Zegras makes, so minus that part of Zegras game.
He needs to get stronger. Muscled off the puck too often. Thats my main, maybe only, concern about Hagens. Would be nice if he could grow another few inches. His brother is 6'0. If Hagens is 6'0 by the draft, we're talking about a player closer to Eichel/Matthews level player than guys below that as prospects.