So I've found the playlist video of
Mars Underground (2007), a documentary about the Mars Direct plan. This should help out a lot in convincing you of what is good about the plan.
http://www.youtube.com/view_play_list?p=60733B58C602DBD3(It's an over an hour long in 5 parts)
Whilest the book describes this in detail and its process of conception, Zubrin goes on to describe what may kill NASA or a Mars mission as bureaucratic BS that disables the mission because it is trying to entertain everyone's developing technology and give money out. So, basically he says the reason we aren't getting to Mars is because everyone wants a piece of the pie and wants their technology to be mission critical - stuff that has been in development for years. They also don't want their missions scrapped.
So, the obvious question is: What does Zubrin have as a vested interest in Mars Direct?
He worked for Martin-Marietta, the people who composed this plan (they compose plans and do other consulting bits to NASA for money).
Does he have a vested interest in a technology required for Mars? Or is he genuinely interested in getting a Mars mission off the ground out of the goodness of his heart?