Picks number 32 Teddy Bridgewater and 36 Derek Carr both have higher passer ratings than Geno and Bortles. Your argument holds no water.
Well lets look back a little further
http://www.nfl.com/draft/history/fulldraft?type=positionYou can see a pretty clear cut trend.
Some guys fell through the cracks (Foles, Wilson, Kaep)
But frequently the best guys go first
Luck, Newton, Bradford, Stafford, Ryan, Flacco, Smith Rodgers, Manning Rivers etc etc
Or put differently if you went back the last 10 years I think youll clearly notice that the first 2~ QBs drafted each year tend to be better than the rest of the list.