The Wine Knows

I'll hazard some guesses at the most important factors that determine a wine's quality? Have I neglected any other critical factors?
* Terroir would obviously influence the end product more than anything else (say 60%).
* The particular season's growing conditions (20%?)
* A wine maker's style/skill including decisions about yeasts and oak (20?)

My point is that if a winery gets 80% of its fruit from within Washington's borders, couldn't it be considered for 1st Growth status in Washington?