I do not know who you are talking to but anyone that has the NBN, myself included, doesn't rate it in the slightest. We used to have cable broadband in our old house and that was much better, even during peak times.
There are plenty of areas that the NBN has yet to hit in or around Melbourne metro, places that have a hefty price tag attached to them. The most disapointing thing about the NBN is that businesses do not have access to it. Our work has ADSL2+, while the download speed is barely adequate, 3mbsp/s, the upload speed @ 0.20mbp/s nulifies any sort of gain we may get. Think of how difficult it is to send an email that is 5mb when you are using a cloud based email service.