Played and finished most of them.
Legend of Zelda was a great original. Finished both quests.
Adventure of Link is a good sequel to the original. I have a strange, but true story related to this game: If you've finished it, you'll know that the last castle is very tricky (at least without guide). Me and a friend has been spending days on that castle without any luck. Everything looks the same. Then one day I told him (It was BS): "hey, I dreamed about playing the game last night, and I found the path to the boss" So we tried it. I was BS-ing to him: "Go left once, then keep going right). To my surprise, we actually found the boss! Damn, must've been Dejavu.
The legend of Zelda for SNES is really good too. Much improvement over the original Zelda, simiar gameplay, but I'd say it's better than the original.
Ocarina of Time was SO GOOD. During the time when everybody is all hyped-up with FF7 and FF8. Ocarina of Time has so much more action into it. I actually bought the game and played it on my friend's N64 since I don't have the console.
Now waiting for somebody who's willing to lend me their N64 to play Majora's Mask.