When would an overweight landing be considered the lowest risk option -apart from the obvious cases of ECAM/QRH stating "Land ASAP" or similar?
Unless my AFM says any different, my philosophy has always been when down to one engine / one genrator / one hydraulic system (braking requirements permitting) / medical emergency. Press problems, other required equipment or commercial considerations would not merit it - but given the design criteria applied to FAR/JAR25 aircraft, a properly executed OWL at a runway of suitable length and with suitable weather is a non-event.