YANBU - mummyblogger is a truly boaktastic piece of terminology.
I also agree that there are some blogs which are crashingly boring and yet so very smug and self-satisfied you want to reach into the computer and strangle the author. But if I find one of those I exercise my right to hit the back button and never return to that page. Not all magazines and books are enjoyable either - so why should I expect all blogs to be?
I blog - but not with hopes of a huge readership and gushing yes-men commenters stroking my virtual ego.
I blog because I'm an English girl living in the US and updating a blog on a daily basis is easier than individually emailing or phoning all my family and friends back in Europe [lazy] but still lets them all know that I'm still alive and happy if they care to look.
My blog is total random stuff (ideas, recipes, photos, anecdotes, weather reports, the latest mayhem my evil bastard cats have caused etc) I don't delude myself that anyone but people who love me would give a rats ass about anything I write.
Yes, I suppose my blog is probably quite boring - but it fulfils it's purpose.
There are all kinds of blogs out there, some meant only for the blogger and some just for their immediate circle of friends/family. Some aspire to wider audiences. A fair number of all types of blog are well worth perusing - if they are about something or somebody you are interested in of course.
But yes, there are a fair whack of bloggers out there who think they're something really rather special, that they have outstanding writing skills and the ability to be funny, moving, inspiring... but without a publisher to tell them they're deluded and to not inflict their garbage on unsuspecting denizens of the internet, you just have to avoid them as best you can.