I think it would help if they were more proactive in resolving things.
I tried out the new DFW Qantas flight in July. I was a bit worried about luggage being left behind on the return leg (departing DFW on Wed 13th) but relaxed when the winds were in our favour and were shaving nearly an hour off the flight - so thought surely they'd have no weight issues then. Plus I saw my bag had been tagged Business (this was my last flight to get me to Platinum) so I thought that might make it one of the last bags to be off loaded if some had to be.
Unfortunately I was wrong and along with about fifteen other people in Brisbane had to file lost luggage reports (and I wonder if there was a similar number who were going on to Sydney who would need to do it as well).
The baggage services desk were fairly nice about it, explained this is common with the DFW flight, I was offered an amenities kit (which in hindsight I kind of wish I'd accepted just to see what was inside, but I wasn't too worried since I was driving home once I got my connecting flight to Melbourne).
The queue went slowly - only having two staff until halfway through the line when another pair showed up to speed things up. I'd been going to try the showers in the Qantas Club (since I just feel a bit grotty after flights of that length) but didn't have enough time after doing the paper work and getting the bus over to the domestic terminal, so I still haven't had a chance to use them yet.
Sadly, I'd checked in early enough to DFW that they probably could have flown my bag to LAX and had it on the direct flight to MEL not too far out from when I ended up getting there.
My flight got in Friday thanks to timezones, Saturday about 1pm I got a phone call saying my bag was in Albury and at about 4pm a guy is dropping it off to me (I live 100km from Albury, which is my closest airport). I'd half been expecting them to make me wait for the Monday freight service to come out here, so it was a significant redeeming factor that they had someone spend 2.5 hours to drive from Albury and back just to drop it off ASAP.
So I was reasonably satisfied with the process of getting the bag to me (only 36 hours late), just disappointed that it is a known issue with DFW and on this occasion it probably shouldn't have happened since they knew they were having an easier flight (15 instead of 16 hours they announced, though it wasn't quite that quick) and could have had it to LAX in time for those flights if they were proactive.
Curiously, while I was in the USA I did the SEA-LAX-LAS run (well, I did want to revisit the Grand Canyon) and for whatever reason, Alaska Airlines flew my bag on their direct flight to LAS separately rather than via LAX for the American Airlines flight I connected to. I was just starting to wonder where my bag was when there was an announcement for me to come collect it from the American Airlines baggage office where it had been dropped in by Alaska staff a bit earlier. So my bag didn't fly with me, but was there on time ready for me.
My other lost luggage story this year was more disappointing as far as airlines go. I did the BNE-MEL-SYD-NAN J run and for whatever reason my luggage got lost in Melbourne (going by the rush baggage tag it ended up with, coming in to NAN on a MEL flight).
AirPacific weren't very interested in taking details or with helping with any kind of amenity kit so I started my holiday with very little. The bag came in on the flight from MEL (which I think is only an hour or two after the Sydney flight) and sat there. A few phone calls later the next day, they finally found it with the "wrong" flight number on it (ie. the MEL rather than SYD flight) at about 2pm and got it to me about 2 hours later. Clearly there needs to be a better process so that AirPacific can recognise luggage coming on other flights and match it to lost baggage reports - if they'd been on the ball they could have had it to me late that night or first thing the next morning.
So I guess other than losing it in the first place, Qantas isn't so much to blame in the Fiji case (though they could have told AirPacific there was a lost luggage bag arriving on that flight that they would need to get to me), but it was annoying to spend most of my first day in Fiji without any change of clothes etc (well, I ended up buying some gear, but if they'd been a bit more proactive then things would have been much nicer). Half of my irritation is due to expectations - that if on a paid J ticket (even a cheap one like for the NAN run) then airlines should be at their best. If on a cheap economy ticket I can understand them being a bit less urgent about it (and would have understood the lack of effort in following up on the luggage - but clearly in MEL they retagged my luggage and could have been proactive in talking to AirPacific). If my DFW flight was paid business (rather than the luggage tagged business because I was Gold QFF), I'd have been really angry that it was left behind.