I have a lot of nostalgia around Mysterio based on old Spider-Man games that I used to play, and have always had the impression of him as one of Spider-Man's oldest and most challenging enemies, but I don't really know anything else about him.
How true to the comics is his portrayal in Spider-Man: Far From Home, with regards to his origin story, the technological (as opposed to magical) underpinnings of his illusions, etc.?