very far from decent? Not all sentences flow correctly but it is good enough to fully understand the story and characters which makes it decent
No. Character development is heavily dependent on the way every character expresses himself and a translation in which "not all sentences flow correctly" will never be able to do it justice.
It's completely fine to play this unpolished translation, obviously. Everyone can experience the game the way he wants. But don't say that you understand it "fully", because that's not true.