There have been complaints about not finding an actor of Asian descent for her roll... which completely ignores that Rita (in various incarnations) have been re-cast as two different Latino women before this point because the original actor died.
3 women played her, 2 different voice actresses. There was the original Japanese actress, An American actress for the series, and an American actress for the first movie. All though I guess I should say gaijin actress as I'm too lazy to Imdb it to see where they were born.
The recasts had nothing to do with the original actress dying, all though she has since passed away. They just needed new footage of her, and their Zyuranger footage was exhausted so they had moved on to the completely American villain of Lord Zedd.
The original Japanese actress showed up in Mahou Sentai Magiranger (her fourth super sentai series) so when the show was made into Power Rangers Mystic Force they did an homage to thr actress by making the character the reformed Rita Repulsa. That's where the second voice actress comes in.
All that being said of course people are going to complain about it. It's the Internet. I particularly love how people are upset that they're not casting an Asian woman, not a Japanese woman mind you. Because who actually cares about ethnicity?