Actually, I played it in japanese specifically to avoid the english acting which I already didn't like from the trailers before the game released. Those "young people trying to sound like old people" voices are simply terrible, and Zelda's fake british also sounded bad to me. I honestly didn't mind Zelda's JP voice at all, it just sounds like anime.
Well trailers aren't the full picture really. Zelda's Japanese voice sounds like anime, and yeah very often the "young female protagonist" role in anime has a brutally annoying voice to go along.
Personally I think both Japanese and English have their strengths and weaknesses.
English has a better Revali and a much better Zelda, as well as also having a great Urbosa, Rhoam and Deku Tree. However, Yunobo and Impa are absolutely awful, and Daruk and Mipha are average at best as well.
Japanese has a better Mipha and a much better Daruk and Impa, and Urbosa, Rhoam and Deku Tree are about as good as they are in English. However, Yunobo is just as bad (if not worse), and Zelda, the main voice you'll hear throughout the game, is insufferable.