Considering buying Mario Party Superstars. Does it have ranked online like Mario Kart 8 does? There's virtually nothing in all of the reviews I've seen on how online works.
Honestly, probably not, nor would there ever be lol You can debate on whether or not the mini-games take skill, however, all of the rolls and map shenanigans are straight RNG. There is no way to make that "Competitive" in the same way racing or fighting games work.