Comparing some of Drew Brees's worst games to that of Taysom Hill vs the Broncos

To an extent, yes. I've had several chats with scouts (both pro and collegiate departments) in house about various players. Generally the evaluation (this players does this good/bad) are the same for everyone. The valuation is where you have differences of opinion. EX: Can player overcome this. What's their ceiling? etc. There are also intangibles (especially on the mental side of things) that are incredibly difficult to quantify.
It seems like you are saying you know how the Saints graded Hill's preseason performances. If so, what were the Saints grades of Hill's preseason performances? I'm curious to know how they graded him.

Also, if you know how they graded him for the Atlanta and Denver games, I'd like to know those as well.