I struggled to enjoy SMS back when it was a new game. It was the only Super Mario game I didn't like. The FLUDD mechanic felt too out of place. The levels were too same-y, with most of the game being in a tropical environment instead of a variety of environments like in every other Mario game. The long jump was gone. The way it played in general just felt... off. It didn't really feel like a Super Mario game despite the presence of Mario and the rest of the regular characters.
I may give it a second chance at some point, but due to prior experience my expectations are low.