If you got this game for free: BUY IT!
And now we'll talk to guys why should they buy it (disconsidering that it's a crime as well).
Here is what i told a guy on gamespot.com about it:
I paid 9,95 on this game and considering how great it is i'd say i got it almost for free.
Also, i really think that it's stupid to get games for free when it's a great game and produced by a small company. Our role as players and consumers is to support these small companies that makes great games. Uplink and Darwinia were great, but Defcon is even better.
So if anyone got this game for free, you should re-think your actions, it's ridiculous and you're acting stupidly. If you want more great games in the future, you should first support the good ones today.
Your turn guys