Apart from side-scrolling platformers, Mario has spent time in JRPGs, jumping into paintings, cleaning up the environment, and zooming around planetoids.
Point is that Nintendo does a wide variety of unique things in Mario games and almost all of it is good. So you could have five Mario fans, each itching for their favorite Mario game. Nintendo will scratch one of those itches and leave four people still irritated.
Look at Zelda. When Skyward Sword came out, you had people complaining that it was too hand-holdy and not open enough like Ocarina of Time or WW or Twilight Princess. When BotW came out, you had another (albeit, much smaller) group of people complain that it didn't focus on story and have a bombastic orchestral soundtrack like Skyward Sword.







