The true value of RDPD is the motivational value. It was one of the few books that started me on my journey. Different things are needed at different times. It's great as a starter book, but once you gain some financial sophistication it looks like a pair of training wheels that you don't need anymore. But people forget that when they took their first bike ride, it was those exact same training wheels that helped them get on their way...
I used to be a huge detractor of RDPD but now I've changed my mind. I used to give Think and Grow Rich to my friends as the one book you need to become rich, but didn't work out well. Now I am thinking of starting with RDPD instead.
Just keep in mind that the value in RDPD is the motivational value, not the financial advice. I frankly don't trust much of his financial advice through my own experiences (but that's just me
).