It's a form of the birthday paradox. In a large enough room, there will be at least one person with a horror story about any airline.
All commercial airlines are pretty much awful. I've flown first class on one or two occasions and--while it's relatively more comfortable than flying in the main cabin--on an absolute scale it's still an uncomfortable, terrible experience. Flying sucks and airline management is the reason why.
… but I have far more horror stories per mile flown with Delta than with Southwest.
Granted, I've a lot less miles flown with Delta, but that's because every ride has been bad… (also, I ended up flying less miles with Delta on one of the horror shows because it seemed like they weren't actually interested in fulfilling their end of the bargain, and switched to a different airline: Southwest!)
All commercial airlines are pretty much awful. I've flown first class on one or two occasions and--while it's relatively more comfortable than flying in the main cabin--on an absolute scale it's still an uncomfortable, terrible experience. Flying sucks and airline management is the reason why.