Some interesting points raised in this video that we also have to contend with in Queensland.
As a former Canberra resident, can confirm the public transport network is pretty slow for those of us that dwelt in the suburbs - but the windy routes (reflecting Canberra’s windy design) that connect to town centres in the satellite cities and their relative infrequency to the rapid routes (including the tram) are big contributors to that. I would never catch the bus from my home in Moncrieff all the way to work in Woden - parking at Gungahlin town centre was a major time saver and way more convenient than waiting for an infrequent bus that would wind through Casey, Ngunnawal or Amaroo before reaching the change to the tram stop. Once I was on the rapid routes (R1/tram to civic, R4 to Woden), the travel time was probably about 10 minutes slower than driving to Woden, a time penalty that would typically be offset if I parked at the far end of the suburb (where parking was free), a 10-15 minute walk to the office (I am a cheapskate and don’t like to just hand money to corporate carparks 
).
In short - rapid network good (especially the R8 for us Gungahlin residents as a direct connection to the major shopping centre at Belconnen 
), ‘last mile’ connections to get home awful.
Advocates often talk about environmental, social benefits and cost because they don’t want to talk about the big downside - time. If the services are not frequent - especially in the off peak - or the route is indirect, or both, it is just not a good value proposition. Worse, there might not even be a service to catch!
Compared to a car trip, catching PT involves:
- walk time at both the start and end of a journey
- wait time
- actual journey time
- potentially indirect and windy route
- interchange time and interchange penalty (in case you miss the connecting service)
- loss of personal space / personal crowding
This is why rapid transit - fast & frequent PT is so important.