The road mentality in the 2017-18 NHL Playoffs has been a budding trend. It is not just that teams are several games over .500 so far -- it's more the idea that some of the top teams just have not been very good.
If you look at the Eastern Conference champion Washington Capitals, they are 4-5 at home, but they are 8-1 on the road. And that's these playoffs in a nutshell.
But as for the Western Conference winning Vegas Golden Knights, they have been on fire, winning 12 of their first 15 playoff games.