Mario Golf is the only sports spinoff series worth playing.
The Super Mario Bros. Super Show is good, and is still the best interpretation of Princess Peach Toadstool we've ever gotten in any medium.
Mario Kart 8 and Mario Kart Double Dash are the only two games in the series that still hold up.
We don't need any more Paper Mario, Mario + Rabbids, Mario Party, or Mario Olympic Games games.
The only reason any person could consider Super Mario World to be better than SMB3 is the ease of replaying levels. SMB3 is superior in every other way, including visual style.