It depends on the type of automated blogging that you're doing. Some people have expressed success with scraper sites, but it's usually short-lived and it's a constant battle to keep up with the churn and burn game. Not highly recommended.
Personally, I've success with auto generated affiliate product blogs. With these blogs, it did take a bit of time for me to get them set up (because I actually customize the content provided in the datafeeds I use in order to have unique content), but many are constantly updated.
If you're thinking of setting up a bunch of Made For AdSense (MFA) blogs, then I'd suggest setting up a quality blog that you pour a bit more effort into because it will most likely last longer and yield better results for you.
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