Simpsons 3-7 are GOAT.
Simpsons 1-2 and 8-9 are still excellent and than the declines and peaks of similar longrunning shows.
Simpsons 10-Infinity are mediocre with the occasional gem, but even the really bad episodes still have a base level of competency that put it closer to say King of Queens than something truly awful like a one season abomination like Outsourced.
Despite this url lying and it not being an oral history, the VF feature about the making of Pulp Fiction is excellent.
http://www.vanityfair.com/hollywood/...n-oral-history