This is, in my opinion, one of the best systems for role playing games. If Wizards had use a more complicated form of this or made this product it would be a huge hit. The best thing about it is that you should know wether you will pass or fail on a skill check, unlike with those random d20 games. The game promotes co-op game play. By that I dont just mean archer stand backa nd let warrior go in to the fray. You get bonuses for working together.
You said this game would be a family game for you. That brings me to my next point. You don't have to play this game as a drak genre. You could make it like Labrynth, Oz, or even Candyland.
I bought this product after opening the inside and reading the prolog.
BUT to answer your question. I don't think FFG does as great a job with their rpg product lines. Wizards shoots out a new book every month. FFG likes to have their games require one book, just encase product fails, which is fine because they are not known for their RPGs. Sadly though that is also a downside.
Dark Hersey and WFRP were already being made by black industries and that is why they have more books.