I'd say it depends on the blog of course but more general issues do play a role. The idea of audience is something we liked to talk about in class. A bloggers audience is like no other audience. It is massive, worldwide, but very unfocused. I hate when I read blogs or watch video blogs with people I dont know speaking like they're my bestie. "Heeeeey people, I just stopped by to say...." I just dislike the sense of false familiarity and it makes a lot of blogging seem way too fake and superficial.
Beyond that I take issue because everyone and their mother has a blog. Whoever creates a blog must really think that people everywhere are dying to know just what they did, eat, made, said, during the day. Its all unsolicited advise.
With these complaints aired I must say I love blogs. I follow tons and tons of them and search for new ones often. Hopefully through out the week I will bring up my other opinions about blogs.