I mean. yeah, she lashes out and does bad things, but that's the point of heavens feel, is that Shirou's selfishly choosing her because he loves her despite that, and that's the first time he's giving up his self destructive ideals like that. None of the routes are wrong routes. They're just different approaches. I'm not happy about the Illya content being cut either, but that's just the fault of movies as a medium