Out of experience i can say it is a great company as a first job. And it is jokingly called the biggest flight school of europe.
In Europe, we don't have the GA scene like in the US so the airlines do hire pilots just after their cpl license. Not only ryanair but almost every other airline in Europe. (A fresh pilot is easier to train to your standards and doesn't have any bad habits he has to get rid of)
And Ryanair can be a decent company to work for if you get the base you want. You work 5 days, are off for 4 and you are home every night. Almost every day i either took the kids to school or was able to pick them up, every day i could cuddle with my wife to fall asleep. Those are the things i di miss about Ryanair.
The bad side is you have to take a lot of abuse, their own interpretations of the law, their disrespect to laws that they don't like etc.
Now, i'm away more nights which s**** but i have to work less, i get paid better AND, i get treated with respect like a human being and i am just happier.
So it's a good place to start your carreer and it can be a nice place to work later depending on what you want.