I've flown with Ryanair many times and have complete confidence in them, from maintenance right up to the sharp end. I do occasionally have problems, though, with understanding cabin announcements from those whose first language isn't English. Some of this of course isn't helped by slight speaker distortion and ambient noise (such as pax talking through safety briefings) but the accents can be a little hazy until you tune your ears in.
Then again, I always pay attention to safety cards.