I go to Jiffy Lube for my state inspection, but that's it. In and out during my lunch break.
I think the fact that they have a sign in the waiting room that says there aren't liable if they strip your oil pan drain bolt during an oil change is a definite flag...
True story:
A couple years ago, I was waiting for an inspection, and a guy came in with a luxury car (I think a Mercedes. Don't they need to go to the dealer for all repairs/maintenance things for warranty reasons?) Mind you, this guy looked like he had never even held a screwdriver, much less know anything about cars. Anyways, he wanted an oil change. He sat next to me for maybe 10 minutes and the tech (ha) came and got him. He told him that they don't have the right oil filter to do the job, but if he wanted to drive to the WalMart down the road and pick it up and then come back, they'd install it for him.
He agreed to do this, and was about to walk out, but I stopped him and recommended he checked with the tech to make sure that the old filter was still on AND the car still had oil in it.
Well guess what? Good thing I asked. They had realized they didn't have the filter AFTER they drained the pan. They simply put the drain bolt and filter back in and then told the customer. Kinda left out the most important part, huh?