I don't think it's really about the graphics, it's more that people now overhype everything that gets announced for Switch.
It's almost as if some - or a lot - fans are living in a state of euphoria due to Switch doing so well and everything announced is as great as Cod, Fifa, Battlefield, AC, Uncharted, Halo, etc., etc..
Personally, i kinda liked the graphical style, for the most part, that is.
And after seeing the clip again, i think the game will become a bit repetitive really soon. But i hope the next vídeo shows more diversity than going straight ahead and swing you beam katana.