Splatoon is a Nintendo series that I’ve enjoyed well enough, but fleetingly. Even with solid shooting mechanics and a playful gimmick revolving around quickly traversing paint-soaked battlefields, the competitive multiplayer often failed to hold my interest beyond a few weeks. Splatoon Raiders isn’t the first time the series has attempted single-player, as each previous game would have a brief story campaign. But it is the first time Nintendo has built a whole game around single-player, and the looter shooter approach…