I think yes, we need to know how reliable dealers are, so name and shame. However I've always thought the back up would be the Factory if all else 'fails' but I've had to return several times for them to fix things they 'broke' whilst sorting other items. They seem very much under pressure these days and I worry that quality control suffers.
Even my long standing 'Tin Top' garage was found wanting recently when I noticed I'd been charged for parts not fitted at service and advised that new parts were needed 'very soon' when they didn't.