Objectivity for Beginners:
I don't like this/this doesn't work because... = objectivity
This sucks!/It's crap!/etc. etc. [yawn] = subjectivity
It's about communication vs. self-expression, folks. We're here to rate the software, not your taste.
On to GG 2.0: Personally, I quite like the way this theme looks - but the problems I experience with really dark themes are:
i) until ShapeShifter can interfere with apps (e.g. Mail) that insist on black text, status bars and the like are unreadable
ii) as most apps still don't let you change the background colour from white, having a very dark theme makes big editing windows in word processors, spreadsheets etc. scream at you - too hard on the eyes for long periods of work.