I use g+ regularly (I know, insert joke about being the only person on the net to do that here). I've liked it, for the most part.
But yesterday? Man. That new interface went live and how I have three tiny columns of posts. Which itself might be okay, except they're in no discernible order whatsoever. New stuff I haven't seen yet is buried off the screen, but there's six things from two days ago still hanging around at the top. Sometimes new things appear in a visible spot, sometimes they don't. I don't know why I need three columns when each one is so small that it's barely telling me anything, and looks like it was designed for a mobile screen. (The iPad app has a similar layout but has much saner ordering and uses 1 or 2 columns depending on the size of the item. It works far better.)
There's an option to turn it back to a single column, but the column stays the same size and now 2/3 of the screen is totally empty while I have to click to expand everything to see more than 30 words and scroll down like crazy. At least in that mode it seems to be ordered correctly.
The main reaction in my g+ circles to the update was confusion. It wasn't even the usual "change is bad" reaction. People were just lost in how they were supposed to read this new layout and find the new stuff in a simple way.
It's funny because g+ started off with a simpler, easier to use page than Facebook had. That's gone and reversed itself now. I really don't get what Google's thinking. As of right now, I'd actually rank the usability of Facebook more highly.