Since the thing isn't even out until next year, my hope is that they revamp the graphics in response to the reception at E3. The chibi look is awful. People posting here are right, aesthetically, Metroid Prime Hunters looked better.
A game releasing in 2016 simply shouldn't look this bad on a system that also includes games like Resident Evil: Revelations and Super Mario 3D Land in its library.
Personally I'd also keep every player's visor the same light blue from Metroid Prime 2, and instead use cell shading to highlight and distinguish each individual player. The primary colors clash so badly with the established design/aesthetic of the Federation troopers.
And this is Next Level Games, they managed to get Luigi's Mansion looking pretty decent, so I have some faith they can turn this around.
Gameplay-wise I think the game looks fine. If there are a bunch of missions, the Blast Ball segment is tightened up, and if they include single cart multiplayer, then I'll probably pick this up. I say this as a huge Metroid fan who owns every game in series except for Metroid Prime Pinball. I don't mind them experimenting with spinoffs, as long as they are quality products. I'd actually like to see more of the Metroid universe outside of Samus.