The review bomb thing was disproven. They were legitimate users on RT. Besides, most movies get haters. But this time, half the fans were the "haters." The massive drop at the box office proved that. And there's a good chance that it hurts the franchise going forward.
It was not disproven whatsoever, it was proven to have happened; people went through many of the reviews and found that many were copy pasted by accounts with very similar names. Also most of the negative reviews were written the day the accounts were made.
Imdb has a much larger amount of reviews and the film has a more positive but still divisive score there.