This game is simply amazing.
Majora's Mask is a direct sequel to Ocarina of Time. I honestly enjoyed this game a LOT more than I did OoT.
The story is very immersive. Link is looking for a 'lost friend' when the Skull Kid steals his horse and curses him. Link then makes his way to Clock Town when the "Happy Mask Salesman" explains that he lost a very important mask and that you have to retrieve it within 3 days. You can go back in time any time you want with the song of time but you will lose bombs, rupees (unless you put them in the bank), arrows, etc. you do not lose the bow, bomb bag, reamins of bosses, etc. The story is just plain amazing, it couldn't get any better.
The sidequests are the best part, in my opinion. They can be scary, funny, sad, it can be anything.
The amount of time you can spend in this game trying to get all of the heart containers and masks is shocking. And other times you can have fun just fighting all of the bosses all over again.
Gameplay is alright. It was an N64 game, so controls aren't the best. Definitely not bad, though.
Graphics, eh. I personally thought OoT had better graphics, MM's feel grainy. Unless its just my cartridge, lol.
The soundtrack is very, very, VERY good. I could listen to it all day.
If you ever come across this game, GET IT. You won't regret it.