For me the navigation bar on the left is easier to use than the old one on top. I don't mind the green (but then, I like to do landscape photography that often has lots of green in it. .)
I have no problem with the width (in Opera) which some folks have been complaining about. I would like to see the main text background changed from black to a darkish grey, which would make reading long articles easier on the yes, but that's just a "druther", not a "gotta." With a grey background, the photos might want a simple black border.
All in all, I think it's good that the changes are coming gradually and seem to be undergoing fairly careful testing.