I have now read all 21 of the Famous Five books, they depict an age long gone, when children could go off on holiday without adults, the "bad guys" are decent and when the Five get into trouble, no-one gets really hurt - tied up at times or locked up, but they always get out of trouble. They have great fun fending for themselves, always find a mystery to solve and solve it too.
The content may be old fashioned - I had to keep reminding my daughter (9) that they don't sit in front of televison all day or have playstations, game boys or anything else. They have to find a telephone box to call the police - no mobiles then. They never get bored, also they eat proper meals and don't snack all day on junk food - they have the odd ice cream and biscuits but they walk or cycle just about everywhere.
Enid Blyton should be compulsory reading for everyone. She was the JK Rowling of her day and I was raised on Enid Blyton books. I am now a mum of 2 and still enjoy reading Enid and a host of other authors of children's and adult books. Have read all 6 Harry Potter books too.