I agree on that--I've been turned off by a few bloggers also, and I'm less inclined to read their fiction if I didn't like their blog. Some of the politicos I found quite interesting, actually, but I liked their work before and probably wouldn't have sought out their work based on their blogs. The worst scenario I had was where an author's blog pretty much bored me. She'd been recommended as a writer, but not a blogger, so I decided to check her out and see if I thought we'd gel. As it turned out, I was completely uninterested in what she was blogging about, and I still haven't bothered to pick up her fiction (which I hear is completely different from her blog).

So it definitely can cut both ways--and it's really just the UF bloggers who have struck me as people who I want to befriend and then read.