I've flown with Air France, Sabena, BA, Iberia, Swissair and Crossair within Europe, so my judgements are based on their European service.
Swissair and Crossair
As already mentioned - great service, friendly personal both on the ground and in the air. Due to their modern fleet, technical delays are low.
Their weak point is the location of their main hub at ZRH though. It seems like there are always delays due to congestion. I'd schedule at least 1.5-2h when flying with these airlines via ZRH.
Service on board is average, but the personal is friendly. SN's strong point for me is their large number of services to secondary European cities like e.g. Hannover or Bordeaux, which offers the chance to do day-trips on connections, that would not be possible otherwise.
Transfer at their BRU hub is quick and one does not have to walk or look around for long.
Haven't flown with them a lot yet (only twice), but from what I've experienced, their service was good, friendly and on-time, and if you have some time to kill while passing through LHR, there is always a lot do do (both in terms of shopping and spotting).
Sorry, can't say many nice things about them. We were left stranded for half a day last September, when our connection flight BCN-AGP (Malaga) was deferred until 2a.m. with no information for or care about the passengers whatsoever. Food on board is substandard and the domestic fleet ancient (about the only DC9 and 72S left in European mainline service).
I haven't been at MAD yet (I wil be in late December), but it seems like their BCN hub is having enormous problems with punctuality - they are leading the list of European airport-induced delays.
The only positive point for me was flying with 727's domestically, which I never had a chance to do before.
My personal favorite. A modern fleet, good and friendly service, great customer care when it comes to frequent flyer rewards combine to make a great airline (at least intra-Europe). AF offers a large number of convenient connections via CDG both within Europe and to the "rest" of the world. A great feature is its special staff, which assists transfer passengers in their search for their next flights as soon as they get from the airplane.
There are just two minor negative points for me:
-Delays suffered at CDG during the summer months (but at least they give you ample information about what's going on, unlike Iberia).
-Flights to some North African and Spanish destinations are still only available from Orly.
Homer: Facts are meaningless. You could use facts to prove anything that's even remotely true!