Are you a man or woman?How old are you?Are you married and if yes do you have children and how many?If not why you dont be married?The name of the town where you live and why you live there?Do you have a dog or cat and the name of his/here is?Do you believe in God or not?Are you Christian or not?
Welcome to the club!!!
Not really need to answer to any question i'm joking welcome!!!
I guess my response is a little bit late, sorry for that ^^
In a different environment (tournaments, sparring games) you have alot of variety in terms of deck choice, to add some special counter cards (One of the most obvious examples would be something like global warming against pure Frost), but for classic ranked games you want to have a deck, that is solid against every color (or at least the popular meta decks). This sort of makes some decks superior due to their consistency or their special strength against popular decks like pure Fire or Shadow Frost. Sure, skill is definitely the most important part and therefore the players strength will decide the outcome of the game most of the time, but some decks have clear weaknesses, that can be abused in certain matchups on the highest level of PvP. Also pure decks are definitely not weak at all. Pure Nature is very inconsistent, but Frost and Shadow do very well in almost every matchup and pure Fire is arguably the strongest deck in PvP. Mixed decks are superior in PvE though.