There is an interview today with NBN Chief Executive Bill Morrow, located here:
http://www.news.com.au/technology/on...6fafa2e2f7db87
Mr Morrow is unhappy about the constant complaining about the NBN and gives some example of how the retailers of NBN are buying lower capacity from NBN so that they can sell lower speed services in a price war to build subscriber numbers. He claims there are plenty of high speed options, but the Connectivity Virtual Circuit that retailers buy is often the bottleneck. If your ISP is trying to pack many subscribers onto a smaller CVC to keep its cost down, your performance will be impacted. There is very little info published on what ISP CVC speeds actually are but apparentl Telstra says they will publish theirs later this year.
Effectively NBN is the carrier, and have no impact on what the ISP retailers can charge, or what mix of CVCs they buy to service their customers. This explains the big variability that users see. So if you think your service is slow, first port of call is your ISP, and don't accept them blaming the NBN, it's the ISP's business atrategy that is slowing you down.