No, because we're all on the same page. None of us have seen concept art, so are opinions are all fairly equal. Quite different than saying, "I don't like JTTCOTE," when you haven't had a ride on it. I haven't ridden it, so I'm not qualified to make a judgement on it's merits.
Think of it like a movie. If he hasn't come out yet, then we all have a valid opinion. But once it's out, saying "I haven't seen it, but it's only so-so," seems kind of weird, doesn't it?