Right, spoken like someone that has never had all their clients cut off from emailing the rest of the internet because one other client at a different ISP had an issue. You are not forced to use RBLs much in the same way you are not forced to use a metal detector in the airport. You don't use it, they use it on you. They are happy to block (oh sorry: list) an entire ISP for having a single problem that may not even be under their control.
Having said that, they also provide a valuable service, but accurate isn't the word I would use.