Hmm, I can not really agree that AUA and DLH are so bad, I do rather believe that they offer quite a good product…
Well, then I’ll post my opinion:
I’ve flown on a few dozen carriers, including Lufthansa, Austrian, Iberia, Spanair, Air Europa, Islas Airways, KLM, Air France, British Airways, Swiss, Qatar Airways, Lan, Hainan Airlines, China Southern, Korean, Air Berlin, Condor, Germanwings and China Airlines.
I must say that I always enjoy flying on our european legacy carriers, the best service was offered to me on Korean however. Qatar Airways, who insist on being "worlds five star carrier" did not impress me as much as their advertising.
So I’d say that my list of best carriers is
KLM and Lufthansa
Swiss and Air France
From the overall product, which seems rather like the one of a Low cost carrier, the spanish airlines are very bad, no complementary service, bad on-time performance and not the friendliest and most helpful staff. Catering on China Southern was miserable, so I include them in the list as well. Lan’s overall product quality has been reduced a whole lot, it is not enough however to set them on the worst list however.