"From my point of view Auto Blog is a kind of spam," I see your point seomarketer but a properly made Auto Blog Focused on a specific subject can make availlable important information. This is specially so if the auto blog grabs content from more than one sources.
An autoblog is not spam in any meaning. Definition of spam: http://en.wikipedia.org/wiki/Spam_(electronic)
When the one of the authors of the original blog from where you're obtaining their content discovered it, they may not only report your site in Google, they can also post something nasty in their blog (especially something nasty about your blog), wait for your software to copy it, and then erase the nasty content to keep the integrity of their blog. You're blog then will have some nasty content AND YOU'LL BE TO BUSY TO CHECK IT.