Statement:
If you have never listened to any particular component, you can't have an opinion on how it sounds.
You are always entitled to an opinion, it just won't be an "informed" opinion. Just as someone may have an opinion of food that they have never tasted. Opinions carry different amout of weight, I usually give more weight to someone's opinion if they have actual experience. However, everyone is entitled to an opinion, on anything, regardless of how informed, or misinformed that opinion may be.