Furiosa was fine. In a vacuum, it was actually pretty good, but in being a sequel to Fury Road it can't shake comparisons.
I figure that it looking so visually similar to Fury Road in trailers made a lot of people ask themselves why even bother watching it when they'd already seen Fury Road. The title including "A Mad Max Saga" is clunky and throws up big vibes of this being a tack on story (which it is), which really doesn't create the kind of hype wave needed to reach out to people who are already cynical about going to a theater.
The word of mouth all seems to start with "Well it wasn't as good as Fury Road, but..." which isn't going to put a fire under the seats of undecided people.