I think you'll find that most of the national chains (although they have widely varying reputations) are finely-honed business machines that happen to fix a couple cars on the side. Its all about fixed-cost, volume, and covering butts. I'm not a big fan that kind of big-business. Things get sloppy and neglected. You kinda get on auto pilot doing 30 brake jobs a day.
By the way, Quick Lube (a western US chain) just got busted big time too. Fined somethine like $5 million and is on suspension for the same thing as Jiffy Lube. Charging for stuff that wasn't done, using the wrong stuff, just crappy underhanded shady stuff.