I've gone through a bunch of translations, from stuff like 'Doomed to Be Cannon Fodder' on Webnovel to official print versions from publishers like Peach Flower House. The accuracy swings wildly depending on who's doing the work. A professionally edited official translation will nail the cultural nuances—they'll keep the honorifics when it matters and find clever English equivalents for idioms about jade or phoenixes. You feel the original author's voice.
But on some aggregate sites, it's a mess. The plot gets across, but the prose is flat, metaphors vanish, and the specific emotional tone of a scene gets lost. I read a chapter where a character's internal monologue was this beautiful, wistful reflection, and the fan translation just said 'she was sad.' That's not the same thing. For romance, where subtleties of longing and social tension are everything, those losses really add up.
At the end of the day, if you're just following the story beats, most translations are 'accurate' enough. To really get the texture, you need to pick your sources carefully.