Overall: 10

Graphics: 9
The game graphics in The Legend of Zelda Ocarina of Time were in an early stage. The second N64 Zelda game, Majora's Mask, had better graphics, since it came out later. Yet, we can't complain about the game graphics : they were advanced at the time, and suited the game perfectly. All the environment was clear and enjoyable.

Sound: 10
The sound and music in the game are so good, they are untouchable, even today. The sound quality wasn't as good as today's, but it was impressive for a N64 game. The in game music is likeable and placed at relevant scenes and locations. The sound effects were great and varied, and even the heart beep wasn't all that annoying (like it was in Zelda and Zelda II).

Addictiveness: 10
If I could, I would have rated it as 11. I enjoyed this game so much I played it  again two times on my N64, then got the upgrade remake on the 3DS, and beat both the regular and Master Quest modes once, and the whole boss battle mode at least two times. But back to the N64 version, I would play it again anytime.

Story: 10
Some might think: the story is just to save the princess... again. Well, that's wrong. In fact, that only becomes your goal at the end of the game, as a secondary goal. The story in The Legend of Zelda Ocarina of Time is that you are a boy named "___" (official name is Link) who is, (SPOILER ALERT! //) after the death of the Deku Tree, headed to meet Princess Zelda. After running some errands for her, you obtain the Ocarina of Time, which lets you open the Door of Time. After you do so and get the Master Sword, you get "sealed" for seven years. You then must obtain all six Talismans of the Sages (you already have the one of light) in order to fight Ganondorf and restore peace to the land (note that the princess isn't captive during that time). (// SPOILER END!)

Depth: 9
The Legend of Zelda Ocarina of Time has 8 temples, 3 as Kid Link and 5 as Adult Link. It also has two side quests (Mask of Truth & Biggoron's Sword) and plenty of optional collectibles (100 gold skulltulas, Ice arrow, Naryu's Love, Farore's Wind and 36 Heart Pieces). There is also a minimum of one item per temple, and other items you can gain across Hyrule. For a challenge, you can choose not to pick up Heart Containers, which gives you will and opportunity to play the game a second time.

Difficulty: 3-10
The Legend of Zelda Ocarina of Time cannot really be tagged with a difficulty, because of the many ways you can play it. To put it in perspective and give you an idea of what to expect, here are two scenarios:

--Diff: 3--
You search far and wide for all the items and upgrades (including songs), and get them as soon as possible. Some bosses might still give you a challenge (like Morpha, though I personally think it is easy to beat, as long as you stay out of water), but you packed fairies in your bottles, so no problem!

--Diff: 10--
You try beating the game with 3 hearts, using the less items and upgrades possible (excluding songs). The bosses become nightmares, and an accidental encounter with a Re-Dead is a sure death. The only way to survive an Iron Knuckle's axe is for the Iron Knuckle to be dead. You will most probably give up before reaching Ganondorf, unless you are patient, persistent and/or determined to beat the game this way.

Thanks a lot! It took me quite a while to do it (especially since I don't type fast).