I just don't get this.
If you want a free blog your going to have to have an account. Period. So what's the beef with G+? If you don't want it G+ then pick something else, but guess what. Your going to need an account there too!
Your here, so I'm assuming you have a live account (unless your on a classic C9 accout) so why aren't you bashing MS for needing an account to sign in everywhere? What's the difference? The name? At least in this day and age it's somewhat uniform and you don't need a separate account for everything..
Personally I like G+ and hope it takes off. At least I actually learn something there from the people I follow instead of the FB Kiddies "OMG I'm buying broccoli lolz"
As for target ads... well ads are a fact of life and guess what. They aint going anywhere for next thousand years so might as well get used to it. At the very least I prefer ads to potentially be something I'm interested in rather than just spam.
Have you tried Google Now? That thing rocks. If I search for say a pet shop on any device I'm signed into my G account with, when I hit google now on my smartphone it will be like hey, that place is open until x o'clock, here's the phone number if you want to call it and you could get there in 15 minutes if you drove this route. Come on, that's awesome. To be able to collate all that in a snap is pretty slick!
Sure it has it's shortcomings just like most things. But in the grand scheme of things, is it really that big a deal?
ps. If you want a decent blog then be sure to check out this; www.ghost.org made by the guy from Wordpress.