I like that there is a little bit of mess because it indicates that individual freedom of thought is well-catered for, up to a sensible point. There are 'better' forums in the sense that rigor is more enforced, but I think they are more for the dedicated and academic that want it strict.
Also, I think everyone naturally comes in with different levels of objectivity. Some new ones might start out shallow, as you say, but gain insight with exposure to more experienced debaters/critical thinkers. The ones that don't learn almost always move on, either voluntarily or with assistance.