I agree with Seth, Seat2A, & Magic. There is a difference between constructive, tangible, criticism vs. vendetta, whining, or just yelling 'THEY SUCK! THEY SUCK!' over & over.
Also, IF I hated an airline so badly, I would let it stick its nonstop(s) where the sun don't shine & choose to enjoy quality service on 2 flights of another airline.

Has anyone here done so??