Why anyone gets worried about a movie before they see it themselves is beyond me.
If you don’t like anything else a hired director has done, don’t like the look of the things being shown to promote the film, feel the story is moving in a direction you’d rather it not, hear from like-minded people that they didn’t like it, ect, ect, why wouldn’t you be concerned that you may not like the movie? Especially if it’s the next part in a series you’ve enjoyed and may not like the conclusion of?
Writing something off before you see it is a different matter, but there a plenty of reasons to suspect that a movie may not end up being what you were hoping for.