As someone who isn't interested in MK8, new maps and maybe one or two new characters (that aren't third party or guest characters) could help me gain more attention.
I loved Dragon Driftway and Ice Ice Outpost, which were added as DLC.
"Just for comparison Uncharted 4 was 20x bigger than Splatoon 2. This shows the huge difference between Sony's first-party games and Nintendo's first-party games."













