Marie - Through the concept of belief, what people do not understand, is that Marie did see Gabriel's fate through the mirror, but she did not see her death. Bastarnized and orphaned her son, Trevor to the Brotherhood of "Light". You also must realize, is that she did not 'sacrifice' herself, she was murdered in cold blood through the influence of the Devil's Mask in which was put on Gabriel by Zobek. You must also take into consideration, that in the end: SHE is the reason for Gabriel's downfall, she LIED to him. But no matter how much hate grew in his heart, Gabriel loves her dearly. As the quotation at the end of the game "I know what it is you yearn for.", Zobek is speaking about his wife, that is ALL Dracula wants back, he could give a (pardon my french) fuck less about humanity, god, or Satan. She too forgives Gabriel.
I liked Marie up until what they did to her backstory in Mirror of Fate. They really soured her to me.
They basically took a woman who was caught up in a huge conspiracy between Lucifer/Zobek and Gabriel/The Brotherhood, and had to deal with being able to watch her lover go through a perilous struggle to save the world and get her back and being unable to help or do anything at all, only to be separated from him. She was just as tragic as Gabriel, and now will now only be able to continue to watch from the high heavens and do nothing to console him.
Then, they needed to keep the plotline going with more Belmonts somehow, so.....they turn her into a bewildered and weak-willed wife who got shoe-horned by a manipulative Brotherhood into not only giving up her and Gabriel's firstborn son without so much as an argument about things, but also had her LIE to Gabe about not only the whole fact they have a kid but also about the fact she knew he'd turn to darkness. And she didn't think once that maybe being honest with her husband might change all of that? The man she knew since childhood, who married him and loved him without fail? Nope, a bunch of old gasbags showed her a magical MacGuffin and threw around the words "fate" and "unchangeable", and she just took it all at face value.
To me, they butchered any credibility she had prior, and from then on out. Good job, MS.