KLM? I used to fly all over Europe with them and they were crap, losing my luggage 2 flights out of 3 (and this is not an exageration)... Schipol airport is a mess... And their meals are terrible (well, they are a Dutch company
).
Air France is ok, except for their disrespectful crews and delays...
Lufthansa is pretty goood, so is BA. Tops are Emirates and Thai.
Ponrauil