Yea, I never played the first two either. I just finished the demo after some hours. I think I'm going to order it from Newegg (36.99usd and free shipping apparently). Personally, I kinda prefer having an actual disc. Don't know why

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It is a humorous and addictive game. Strangely enough I just saw that this is an xbox game too. Didn't feel like a console game. One of my favorite moments was watching the presidente run up to some rebels and opening fire on them. Balls of Steel, but shortly after that he was seen "Strategically Retreating." Then the rebels blew up a farm and a lot of bananas. Jerks.
The only problem I can say I had with it, after playing the demo, is that I couldn't seem to make some plain dirt roads. Just looked weird to me having those nice freshly paved roads winding around. Also, cars going through people kinda irks me from time to time.
ps. Nice music, but I hope like hell the full game has more songs. If not, I'll have to make my own playlist of fitting music.