I agree so much with what you said!!That’s exactly what I mean and complain about. I don't like bad character writing, it ruins the narrative. We can all improve that, and yet the creator decided to overlook it. He has the right to do so, just as I have the right to complain, I don't like it. And regarding English titles, of course many popular games do it, but it seems so bland to me that they keep doing it... So many languages, even the creator's native one, can yield interesting titles, but no one makes an effort, that's annoying too.
I understand your frustration, and it's completely normal to feel that way sometimes. You have every right to share your opinion, that's true. However, I think that instead of presenting it as a complaint, you could perhaps make it as a kinder suggestion. It's often easier to encourage people to do their best through constructive feedback rather than criticism.
Personally, I really admire visual novel creators. Programming, designing, creating characters, and building an entire story can't be as easy as it might seem from the outside. Just a suggestion!;p