Fan translation accuracy for manhwa is a real mixed bag, honestly. You've got groups that treat the source material with real reverence, spending hours debating cultural nuance and even adding translator's notes. Then there are the speed-scan groups that seem to just run the text through a machine and call it a day. I've seen panels where the English is so garbled the plot point is completely lost. The worst is when honorifics or specific Korean terms are just dropped entirely, flattening the characters' relationships.
That said, some fan groups have become incredibly professional. I remember following 'Solo Leveling' early on, and while the official translation later smoothed things out, those early fan chapters captured the hype perfectly. The passion is there, but consistency isn't guaranteed. A series might start strong with a dedicated team, then get passed to a less careful group midway, and the quality nosedives. You're always taking a chance, but sometimes that gamble gets you a chapter weeks before any official release hits.