this opinion piece from an Australian newspaper is a few years old but I thought related well to some of the discussions on here.
I particularly like this paragraph at the end:
Interestingly, I think John Marsden, one of the Australian writers also discussed in here is or was an Enid Blyton fan. I don't know this for sure but know that he did give a presentation once entitled "Shakespeare, Enid Blyton and Me". His "Tomorrow When the War Began" series makes an interesting comparison with the Famous Five. While much darker in its themes (ie, imagines a future where Australia has been invaded by a foreign power), I think a lot of its appeal for young people lies in the fact that it centres around a group of young people having adventures and solving problems without the interference of adults - just like the Famous Five did.Blyton's books are still relevant to some Australian children and the reason is clear. The Famous Five took risks and did stuff. They did not sit in front of television to be entertained. Blyton offers escapism and novelty. Moreover, the Famous Five children were happy. For some children, this is an appealing fantasy.