Majora's Mask, underrated? Ugh, I think that's one of the most overrated games ever. >_> Don't get me wrong, it's a good game, and I love Zelda, but so many Zelda fans nowadays go around praising it as the best game ever. Sure, it was different, but not as great as everyone makes it seem, in my opinion at least. I think Ocarina of Time is much better, in terms of enjoyment. Majora's Mask is just too frustrating. That might be perfectly fine for some people who enjoy that kind of gameplay, but for most people, Majora's Mask doesn't offer the same kind of universal appeal that other Zelda games do. That's my two cents, anyway.What is the most underrated game for you guys?
I'd have to say MM, but also Sonic the Hedgehog 2. Those, and Link's Awakening.
As for the most underrated game I've played... That's a tough question, actually. Wii Music is one of the first games that comes to mind. The game gets so much hate, but it's really not that bad of a game. It's a great experience and a really awesome idea. If a few things were added or improved (such as the song selection and the ability to download new or even create your own songs), it could have been a huge hit. I'm hoping for a sequel that expands upon the original.
Other games that would make my list would be many Sonic games. Sonic gets a lot of hate these days, but the games aren't really as bad as many people would lead you to believe. Sure, there have been some genuine goof ups in the last decade, but even some of the most criticized Sonic games aren't that bad. I thoroughly enjoyed Shadow the Hedgehog, and I didn't mind the Werehog stages of Sonic Unleashed that much. And Sonic and the Black Knight was awesome. But to each his own, I suppose.
Also worth mentioning are Kirby Air Ride, Metroid: Other M, and the Legend of Zelda: Spirit Tracks, among others.