Having recently flown with all 3 airlines and having no allegiance I can speak about them candidly.
The service you get at QF is great domestically in my opinion.
When you fly with a lower-cost carrier you essentially get what you pay for.
Both
VB and J* still provide a much higher level and standard of service that you get whilst flying with a premium cost carrier in the USA.
The level of service in the USA on the main carriers is crap at best (and that's being kind).
Recently we flew with AA from LAX to Dallas FortWorth and were lucky to get our "boxes".
The coffee was unidentifiable to say the least (and I'm no coffee snob either!).
I'll drink anything warm and caffeinated but this stuff tasted like it had a crayon dipped in for colour!
A main meal was out of the question and the Flt Att's moved so damned slowly like they were on Mandrax!!
Having a 55+ average age probably didnt help either.
Also flew with Delta and had a similar experience.
No wonder their system and airlines are in such disarray.
As Woomera has suggested, get out and smell the roses guys.
If you experience the level of service elsewhere you'll never complain about our Australian airlines ever again.