Nick Foles was NOT "awful" in 2014.
That's just categorically false. He played behind an OL that was a mess almost from the start and it showed. He was a weapon down from 2013 and still posted decent numbers and a 6-2 record while that D wasn't all that great, either.
I can understand not drinking the kool-aid, but there's no need to endorse PFF's urine as a solid brew with a fragrant bouquet.
Last year Quinn wasn't elite? He may not have had the stats, but then again, do we need to repost how many holding calls he DIDN'T get in the first five weeks? I mean it looked like NBA refereeing back there.
If PFF's stats were solid, then they could be used for analytics and over time, they could model which players would be better values. They have enough data now that they could SELL that data to teams. THAT would be worth a TON of money to teams.
Rest assured, they do NOT have that data and their stats do NOT hold up. Not contextually, not analytically and not statistically. Hell, the stats aren't even uniform as they have multiple people performing analyses with varying degrees of biases.
PFF grades can be helpful as a FAN based fantasy tool, but it's just not a professional tool. I'm sure teams look at it as a cheap way to survey players, but I can't imagine any FO worth a damn trusting PFF grades to make personnel decisions or even as a deciding factor.