Unpopular Opinion: I like the Mario and Sonic Olympics games. They remind me of track and field and are decent fun. They are also a bit like Mario Party, but without the backstabbing.
Finally, there's this:

Sega and Nintendo: "Hey we're gonna do a crossover game for the Super Mario and Sonic the Hedgehog franchises!"

Me: "Oh sweet! Is it gonna be something like a 2D platformer that uses gameplay mechanics from both franchises?"

Sega and Nintendo: "LOL no." makes generic sports spin-off