Vincentdante
Time-Traveller
Honestly all of the adaptations have been very faithful, even the Studio Deen one. The problem is that western Fate fans are obnoxiously elite and ironically give their own franchise a bad name because of it.Makes me glad I've never played any of the FGO games so I go into the animes/films blind and enjoy them for what they are.
Also I don't take notice of reviews, I watch things if I like the looks of it.
I count myself as a fan who has seen the original source material and I am happy to say the VN is overrated. It's good but not "amazing perfectionism of story telling" as you might be led to believe.