Why I like this game the most compared to the others

This is true, Mario can have moments of seriousness but ultimately it's supposed to be fun and lighthearted, Mario & Luigi got it right.

In fact the lightheartedness help when a scary moment come because you don't expect it, Kirby kind of do this with a cute universe and funny scenes, and then you fight a giant eyeball that bleed or a former kind ruler which went mad.

Imo, it's the luigi's games like Luigi's mansion which should have the darker storylines, even Miyamoto agree with that (IIRC, he say in an interview that Mario should remain lighthearted while Luigi's games being more atmospheric and overal more scary should be the one to have this kind of story)

Well first, i don't consider Luigi's games to be an aspect of Mario really because it go against his developpement, Luigi's whole story is to become different from his brother, from Mario clone to an unique character with his own personality, so he shouldn't be constrained by Mario standards. This is my oppinion through.

In fact look at miyamoto's view about this:

"On the other hand, I do think that the world of Luigi's Mansion and sort of the kind of "scary feel" to the mansions and whatnot is something that has a big contrast to the Mario games, which obviously are very bright and more action-focused. So having that nice story that wraps around the Luigi games is something that perhaps lingers with people a little bit longer and when they think back and remember it, they think 'Oh, I want to experience that again."
www.gonintendo.com/s/197515-miyamoto-grateful-for-luigi-s-mansion-fans-working-with-next-level-games

Personaly i agree with what he say here, Mario's world and Luigi's world are contrasting, so Mario game should stay lighthearted and bright with no story or at least a funny one while Luigi's mansion should have a darker tone and more "scary feel" with a nice story. Dark moon and the first did it right and i hope they will continue this way.


But when i say Luigi's games should get the darker storylines, i mean the TTYD and SPM's stuffs would work better in a Luigi's setting than a Mario one, since it's already supposed to be in a darker tone and Luigi is a cowardly hero who is basically put in a setting where he has to fight all the things he fear, King boo was played for seriousness and it worked for the setting, if he was done in a RPG, the impact would have been different.

It's ok to disagree, personaly i like when Mario can go darker and more complex but i accept that some peoples don't feel the same way, like how Alphadream say, the good thing is to find a good balance

Luigi's mansion may be a lighthearted take on the survival horror genre but it's still a survival horror, so the setting is naturaly darker than say, a mario action platformer.

But like you said, the games are full energy and personality all wraped in lighthearted survival horror which is why the story ideas of TTYD and SPM would work better on it.

Mimi for instance is based on the exorsist, well her character would work perfectly for a lighthearted survival horror like Luigi's mansion, since she would chase you in spider form accross the mansion and you must find way to hurt her with the poltergust 5000.

In fact i'm sometime joking Antasma would work better in Luigi's mansion since he is bascially a ghostly dracula, in Luigi's mansion his story would be a lighthearted take on Bram stoker's Dracula (Egadd send you to a mysterious mansion in which you are greeted by a strange human being but as you inspect the stuffs, you discover his true nature and Antasma go back to his ghostly form which you must then fight in a boss battle)

I don't think the other storylines were a lot more serious but I too like this one the most simply because it's what started it all and although the other ones were fun, this one's charm is unmatched.

Can't say the same about the original Smash Bros though, it was great of course but the Wii version was much more refined in my opinion and trumps it.