In my opinion, none of the replies were wrong but they were too absolute. Successful product managers work from a tool box and know what tools to use in each project, campaign, or circumstance. I always review the project, life cycle, current market, resources, teams, etc. and adjust my approach accordingly.
I found a great image capturing many of the common PM traits and embellished it to include grit, energy, experimentation, transparency, humor, and enthusiasm. I'm very sure that most of this collage would apply to managers in general.
What would you add to this list?
Original image: http://www.wordle.net/show/wrdl/5361235/What_is_Product_Management%3F