A few things that come to mind:
1) One thing that jumps out at me scrolling through his transaction history is that he hasn't been afraid of making big moves even in his short time as a GM. The whole Rantanen affair maybe didn't exactly work out the way Carolina hoped it would, but he took a massive swing and was even able to come out of it relatively ok when it became clearer that Rantanen didn't see himself in Carolina long-term. He's also gone big on a lot of his contract extensions and I think generally they all look like great deals even at the time and they'll only likely age even better as the cap explodes (Slavin, Jarvis, Stankoven, Blake all got 8 year deals).
2) I appreciate that he's a legitimately intelligent individual in a wide form of areas, hockey and otherwise.
3) I think he deserves a ton of credit for getting to where he is now. This is a guy with zero hockey background, zero hockey connections, didn't have a famous last name, didn't have a dad who owned Boston Pizza and was able to buy him a hockey league to get his career started with. He started writing about hockey almost as a hobby, turned that into a consultant position with the Canes, and then just kept rising through the ranks with that organization going from: consultant -> analyst -> director of analytics -> VP of hockey management - > assistant GM -> GM. In a league filled with nepotism one way or another he earned everything through pure merit and hard work.
Points 2 and 3 are I think particularly noteworthy in how they're such a stark contrast to the current trend of GMs just being dumb, uneducated former hockey players with no real world talents or skills that get handed GM positions on a silver platter.