Lots of speculation that Google authorship is a flop or a "defensive play". I don't see it that way (yet). Is it too complicated? Yes. Are the benefits spotty right now? Yes. Does that mean the future will be like the present? Not a chance.
I suggest using Google Authorship as a hedge your bet since the cost of getting involved is small (adding some tags) and potential benefits large. Will ask my G+ friends to weigh in.