That cheapness is partly mythological, once fees and "taxes", plus baggage costs (thirty nicker a case) and so on are included. Oh, and the amazing costs they manage to include for using a credit card - which they charge you twice for on a return ticket even though you're making just the one transaction.
Then there's the late schedule changes, which then fuck up the tickets you've bought for trains and coaches from the airport.
And nothing, nothing makes up for the way they cynically and openly treat you like shit. You know the Goodfellas routine, "fuck you, pay me"? That's Ryanair.
But Zaragoza airport is an hour and a quarter away and the next closest is five hours. So fuck me, I pay them.