maaaze wrote...
Raising Questions and adding Points to it is the main porpuse of any kind narrative structure.
I think I understand where you're getting confused.
You're confusing Mass Effect's ending with an ending that gives the audience a question rather than an answer.
This actually isn't as common as you're making it sound since most authors love to preach to their readers, and try to have a very clear message in their story.
Although other authors prefer to end the story with a question. The question isn't a question of the events of the story, but a question of what these events mean to the reader. When the audience is asked to find their own meaning it doesn't mean the audience is asked to make up their own ending.
It means the audience is meant to ask themselves what this means to them on a personal level.
This isn't literally leaving the audience without an answer. All of the important aspects of the plot should be fully resolved upon the completion of the story unless they in some way where meant to be left unresolved to make the audience ask themselves a question.
An example of this is a story that ends with a man being held at gunpoint. The entire story was about the man who is about to be shot. The story made the reader learn more about them, and care about their struggle. Though the story also focused on the man's guilt and the things he had done in the past. Throughout the story, the reader is expecting for the conclusion to be when the man finally makes peace with his past.
The story ends with the man being at the mercy of someone whose life he destroyed beyond repair. The story ends without letting the reader know whether or not the man lived or died. Instead it ends by asking the reader a question, "Did he deserve to be forgiven?"
All other plot points are completed, and resolved. The falling action tells of how everyone else who the man made peace with is now better off, or how their lives have gotten worse. But the reader can't be told whether he lived or not, because that ultimately depends on whether or not the reader believes he truly deserved to live.
This doesn't exactly mean that the man's death would be a bad thing. In a situation like this, death could be seen as the ultimate act of retribution. In death, the man is finally free of the horrible things he had done. If he dies, he is finally free from his past sins.
Catharsis is still achieved whether the man lives or dies. It's ultimately a question of what the reader believes about redemption.
Inception, Old Boy, the Prestige, and many others all had endings like this.
The audience is ultimately left with a question of what they think is the best resolution to the story, and is then expected to dwell on what this means for them on a personal level.
Mass Effect 3 didn't do this. At all. You can't even pretend that it did. It doesn't leave the player with anything. It doesn't even reflect on the main message of the entire series that was paramount in Mass Effect 2.
"Our greatest strength is what makes us different."
This is even brought up again in Mass Effect 3 when Javik explicitly states that the reason the protheans fells is because they had focused too much on assimilation rather than letting different cultures breed.