At a Merchant's Tire and Auto location in Waldorf, MD, I had the worst experience of my life. Went in for a simple oil change and got my care wrecked instead.
Incompetent and untrained staff improperly secured my car (2005 Dodge Stratus 4door sedan) on the lift and it dropped 6 feet, nose first into the cement garage floor. I had extensive front end damage and frame damage. The store manager was so unprofessional, he was eating his lunch while explaining what just happened.
They covered the cost of a rental car and body shop repairs, but it took 2 months to get my car fixed. Car "mysteriously" needed a tune up, new oil pump and front wheel tire rod/arm less than 2 weeks after getting it repaired.