Now that it's default, how do you feel about it?
I don't like change (like Jacob) and think it's taking on too much of a Facebook look. It's harder to find common things on the pages. The old left-hand menu is moved to the top and reduced. There's still no decent iPhone/iPad version. I don't like the Wikia bar across the top.
On the bright side, formatting like lists and sections is easier on the eyes. It also seems to have been optimized a bit. I've noticed a slight decrease in page load times.