737 should not be used on flights over 3 hours and especially not on Interantional travel. They is hardly any leg room in Economy. There are only 2 toilets at the rear of the plane which is not enough, especially when the plane is full. The Galley is small and located near the toiltes. This makes it very difficult for staff to serve customers as they have to push past passengers waithing to use the bathroom.
I fly Qantas fairly frequently but these planes are not good enough.