I can't stand their charging policy - upsell, upsell, upsell.
Just tell me the price and I'll decide whether or not I want to pay it rather than hide, obfuscate, and sneak extra little bits on here, there and everywhere.
The last time I flew with them I'd forgotten to print off boarding passes before getting to the airport. I accepted that there would be a fee to do this - but not £80 each for the two of us, so it was £160 to print off a couple of bits of paper at the airport.
I avoid them like the plague now.