Lufthansa, IMHO, is the best, as long as you avoid the SwissAir crews (although they're getting better)...Virgin Atlantic's also pretty good. BA's kinda hit or miss; last experience was beyond awful. Air France is definitely lower, Alitalia lower still.

Just my 2c's.

FYI -- Lufthansa had in-flight wifi a few years ago through the Boeing program; it was pretty cool to surf over the middle of the Atlantic back then!