Majora's Mask is a bit of a black sheep in the Legend of Zelda series; some absolutely love it, while others find it too cumbersome and weird to enjoy. As a direct sequel to Ocarina of Time, Majora's Mask reuses the same engine and similar gameplay elements while recycling a ton of graphical and mechanical assets from OOT, but places them all in a new world, Termina, with a central gimmick of having a three day time limit constantly ticking in the background as you work to save the world from total destruction while the moon slowly falls on a collision course towards Termina. A bit like the Harold Ramis and Bill Murray film Groundhog Day, all of Termina's NPCs follow the same scripted schedule over those three days, and you have the power to reset time to the beginning of the cycle to do things differently and change people's lives, if only temporarily, until the next reset.
With a fairly dark, depressing atmosphere, a story that has nothing to do with the usual Zelda, Ganon, and Hyrule motifs, and more demanding, sometimes obtuse gameplay, it's no surprise that Majora's Mask isn't universally loved. It's a pretty weird game, after all, and I can totally understand it not being everyone's cup of tea, but it's those uniquely weird idiosyncrasies that make it my favorite Zelda game. It is a bit of an acquired taste, though; I actually didn't like it much at first, because it felt like too much of a weird departure from Ocarina of Time, a game with which I was fanatically obsessed at the time. But over time I came to appreciate its differences, and realized that it's actually better than even the more modern Zelda games in a lot of ways. As I was playing Breath of the Wild, for instance, I couldn't help but occasionally wish I were playing Majora's Mask, instead.
With the N64 quickly becoming more and more obsolete, the Majora's Mask 3DS remake aims to bring Majora's Mask to a new audience on a platform that is both readily available and also playable, while also improving the original game's accessibility with a bunch of quality of life improvements that make it not only easier to play, but also easier to understand. I was inclined at first to say that the 3DS remake is now the definitive way to play Majora's Mask due to the superior graphical quality, technical performance, and user interface, but unfortunately Nintendo also decided to make some radical changes to things like overall difficulty, boss fights, and transformation masks, which leaves me more conflicted about whether I'd actually recommend Majora's Mask 3DS to first time players.