The word would be objectivity, and the actual reason would be your lack of it.

So actually you don't have, ok

Whatever helps you sleep tonight.

I can sleep and awake anytime i could you know

I agree with everything up there except Metroid Prime.  It was a complete revamp of a series done extremely well and excelled in atmosphere^. 

Nintendo games have a consistency to them yes, but shouldn't a true 10/10 be able to satisfy as many gamer tastes as possible?  A good story/narrative should be required then. Or at least revolutionary/highly innovative gameplay to bump it up more like Metroid Prime did. 

Games have LONG been able to include great stories with great gameplay.  It's not necessary to have a story, but for satisfying as many tastes and preferences as possible it is.  To make sense more as a true 10/10 experience I'd argue it is. 

Sometimes I don't want to play a game with a story and sometimes I do.  I enjoy plenty of Nintendo games that don't have a note worthy story, but I wouldn't consider many of them past the the revolutionary games they evolved from to have much worth in the reviews department.  Once that revolutionary well has been dried up you need to focus on value, and the vast majority of Nintendo games are missing quite a bit of story value to them.

Are you suggesting Nintendo needs to work on having better narratives? Oh please God no! By far and away my most hated aspect of gaming is the inclusion of long drawn out stories with non stop talking, rpgs being an exception for obvious reason.

I hate stuff like red dead 2. To each their own but one of the main reasons I love Nintendo is because the story takes a major back seat to actual gaming.

They don't have to if they can't pull it off.  And if the game has a skip cut scene option then your problem is almost completely gone. For those that need a great story to be fully satisfied though they would be out of luck just playing a game that only has good gameplay. 

Just saying that there's plenty of great games out there that get lesser scores despite covering more ways to enjoy a game (the story and gameplay aspect).  But so many of them only get 9s and not straight 10s like Nintendo does.  Nintendo games usually do not have any fulfilling story aspects to add much of an emotional connection to the game's world. 

You can argue about their gameplay being so good it makes up for that, but I'm not buying that.  It's too subjective now.  It's more objective to argue what gaming aspects are not as prominent or more prominent in a game.

The need for a compelling story varies from game to game. A game like Mario would not benefit from having a truly compelling story, as all it would do is take time away from actually playing the game, so having such a story would hurt the overall experience. So the absence of a compelling narrative is no reason to lower the game's score. A game like Fire Emblem, on the other hand, where the player has to grow attached to the characters for the permadeath system to mean anything, often lives or dies by its story.

I usually find that the stories of Nintendo games do their job. The Metroid games - other than Other M - excel at environmental storytelling. The way Skyward Sword built up the friendship between Link and Zelda made for a much better motivation to move forward than the seeking out of macguffins was in earlier games. Fire Emblem Awakening's story meshed perfectly with its game mechanics. Super Paper Mario has some of the best and funniest dialogue in any game.

I find narrative-heavy games that could just as easily be a movie without changing anything to be very overrated, which is part of why I don't care much for Naughty Dog games. If a game's story does nothing to take advantage of the video-game medium then it will almost always come up short when compared to movies and books with similar stories, like how no Uncharted or Tomb Raider game will ever come close to having a story or characters that are half as compelling as Raiders of the Lost Ark. A game like Mass Effect with its myriad of choices or Bioshock, where the game's big twist is a commentary of the player-game relationship, those are stories that benefit from being told in video-game format. But with games that want to be movies, the movie will almost always be better anyways, so why bother.

Tetris Story Mode.

Gran Tourismo Story Mode.

Tony Hawks Pro Skating Story Mode.

FIFA Story Mode.

Without a deep and compelling story these games could only be good, never great and never can get 10s.

I couldn't possibly disagree more.  Some games require a strong story, others do not.  It makes absolutely no sense (no offense intended) in my mind to force narratives in all games.  Doom for example doesn't need a story like the Last of Us.  Mario, PIkmin, Luigi's Mansion, etc do not need a strong narrative.  Variety is what makes gaming good.  Setting up a review system where all games need to have the same features doesn't make a lick of sense.  It isn't that Nintendo makes up for the lack of a narrative, their type of games don't need a narrative, and frankly a strong narrative wouldn't fit well.  

As for personal preference, SotC and Ori have the best stories in gaming, IMHO.  Neither of which have strong narratives.  

As a life long Nintendo fan, if their games turn into RDR2, TLoU, FF, etc they will lose me immediately.  I want little to no focus on story elements.  It just isn't my thing.