I do use Lounge key, it is not bad, I only had an experience like yours in MIA, where they offered me a Discount in a bar instead of a Lounge.
But in several other countries, I have a Lounge available, most of times, from a good level. Satisfied by this time, but I have checked the Australian network, it is poor. I'm lucky I'm not flying there. They need to improve in Aussies network