Back and back to critics

I'm sorry it has been almost a week now but I was busy. I want to go back to the subject of what makes a great critics. In a perfect world I would see it as a person who has never seen a play but know what makes one good and what makes one bad. Of course this is impossible because true learning come from experience so where is the line that would make a perfect critic. I have come to learn that it is about 10 to 12 plays of course this only last for a short period of time because i have seen about 10 and i can keep the essence and beauty and now i am starting to find more specific things that were missing. I think is the truth but i may be wrong so dont take my idea for stone and tell me what you think it should be.