I was going to say that the inactive tabs look active, and vice versa. Then I opened Coda 1.x (haven't used that in a while!) and Coda's custom tabs look very similar to the current Aqua tabs as far as shading goes. I'll try to get used to it.
I'm glad the theme has a name of its own now. After switching to Aqua, at first I had some weirdness where the tabs weren't lining up (they appeared too large for the "tab bar"), but a restart of Sublime fixed that.