Some areas transition abruptly, others transitions smoothly. That's just how it is and there's no need to get worked up about it. Since this is a community project and there are varying skill levels, sometimes areas just won't flow well.
At any rate, is there really any point in calling out someone's work as bad? Trying to point fingers accomplishes nothing because what's done is done, it would hardly be sporting to erase their squares and redo it or something because you think it looks bad.