I don't mind letting someone change my oil, I just mind letting them do it without me seeing it being done. I'm too big to get under my wifes car, so I take it to a Wal mart that has racks where I can see it getting changed. I also tell them what I expect before they start.
This is the truth. I once had a female clerk at a jiffy lube tell me that sometimes, they don't even change the oil in your car. They say they did, and then change a friends oil later. This was one attached to a sears, and boy did my face turn red. I was questioning her as to why ALL my fluids were low 2 days after having a full sevice oil change there.
Live and learn. I've always changed the oil on my truck unless I was on the road. Much eisier to get under it.