What's really original about this movie is that it's a lighthearted and happy take on lobbying and the tobacco industry. Both sides are represented very fairly with surprisingly sharp arguments, and watching the main character talk and spin the facts is remarkably intriguing. The story keeps up the pace and never loses steam thanks to the fantastic writing and the generally great acting, but it leads to what some may consider a somewhat disappointing conclusion (though a great final act).
I highly suggest watching this for the perspective on argumentation and "spin", if nothing else.
In a sentence:
A fantastic take on lobbying and argumentation supported by great writing and pacing, and a surprisingly lighthearted and happy tone.