I had a similar one years back, QF ticket turned out was code share on Vietnam Airlines.
Worst flight I had,
3 seats across center row, myself on aisle lady on far side and her 2 kids sharing center seat..1 vomiting milk on take off was a bad sign
Think 1/2 the people on the flight had shopped at the Queen vic market 3 hours prior to take off and brought on carry on...lots of aromas.
hour into flight some-one blocked the smoke detector in the toilet in front of me to use as the communal smoking room for the whole plane.
add in some disgusting airline food
the aroma by the end of the flight was horrific
Changed travel agent after that one.
I have learnt to check all flights that I get quoted now.