ehhhh
most Mario Party's and Mario sports games for the last generation or two have been fairly mediocre. the Mario Party games already started to suck arguably at the end of the Gamecube era and Mario Tennis / Mario Golf have always been games that have limited amount of content just due to their style and agenda
as long as there a good 3D Mario mainline games, good Smash games, good Mario Kart games- that's a priority. I enjoy Party and Tennis but obviously those are second or third tier (although they really need to stop making terribly Party games, go back to the old formula)