For the Ryanair junkie, who is prepared to fly to whichever destination is currently on special offer, midweek, and get an Electron card to reduce the booking fees, there are some very good deals to be had on Ryanair.
But for most passengers, who want to get to a specific place on a specific date and don't want to get another debit card for the purpose of booking the ticket, the legacy airlines often work out cheaper than Ryanair. And at least they try to give the impression that they are pleased to have you as a customer.