The Kaguya-sama dub is good, but having watched the entire series in both Japanese and English (in that order) the narrator is actually the one thing I could never get used to—I prefer the mostly played-straight Japanese narration to the jokey American narration, since I think it fits more with the overall tone of the series where the silliness of the "war" is heightened by the melodramatic acting, direction, and music. That being said, the friends I watched the dub with similarly pointed to the narrator as one of their favorite things about the show, so I seem to be in the minority here, and obviously my opinion is colored by having watched the sub first.