You pay £8 to fly to Spain, realistically what service do you expect!?
I expect a plane to take me from Liverpool to Girona on time. It did.
No complaints there.
I had (non-Ryanair) insurance that covered me in case of cancellation/delays. I had no hold baggage, I checked in online, I bought no food or drink on board. No problems. In fact I had (as mentioned) a whole row of seats to myself and just went to sleep.
I'm no particular fan of Ryanair or any other airline, they provide a service for which I expect to pay but Ryanair should be congratulated for bringing such incredible competition to the skies and driving prices down. Like any company at the cutting edge of competition they've got extremely slick marketing and very good publicity but as others have said, there are plenty of alternatives out there.
If you're free to travel whenever to often slightly out of the way places then they're great, you can often pick up flights (inc taxes) for £1. So long as you expect no frills I don't really see what the problem is.