I know jack all about cars....
Used to take my POC Saturn to Jiffy and Mr. Lube...not once was I in and in out a decent time...keep in mind, I wasn't waiting in line, I was actually in there but the guys apparently didn't know how to service my car, didn't have the part, or didn't know much more than me!
Took my POC Saturn to a Midas once...fell for all the gobbly gook about what my car needed done...apparently my suspension was shot...but what do I know. Almost 2k later, I drive away, there's a rattling under the hood. I turn around, take it back, and turns out the mechanic left his wrench under my hood!
Stick to dealers...at least when shit hits the fan, you have someone to yell at, and escalate if things get really bad!