One for the good guys, one for the bad guys...
I live about 2 miles from a Ford dealership with a Quick Lane shop. Never had a problem, they have low turnover and most of the mechanics have been there since day 1 which was about 6 years ago. Usually I do an end-of-year OC when it is too cold outside for me to do it myself, so I bring my own oil and bring my vehicles there. They have no problem with letting me watch, in fact if it's not busy they don't mind if I chat with the techs as long as I don't cross the yellow "work zone" line for OSHA reasons. Great folks, always accommodating by bizzare wishes!
On the other hand...
In college when I was short on funds and short on time, I would have half of my OCs done at Jiffy Lube, Oil Doctor, or Redi Lube Plus. No matter which of those, and no matter where it was located, bad things happened so often that I gave up on them. The straw that broke the camel's back was at a Redi Lube Plus on route 12 in Worcester, MA. They did the old trick of trying to sell me a new air filter at some ridiculous price and claiming that mine was too dirty. At least I think they were honest enough to actually be showing me my own filter...because when I left there, the vehicle was running a little differently (94 Blazer with 4.3L Vortec V6) and the Check Engine light came on immediately. Looked under the hood, and half my airbox plus the filter were missing. Went back to the shop, apologies all around, they gave me my money back and tried to offer me coupons for free services...NO WAY...I walked out of there for the last time and never looked back.