Operation Flashpoint is one of the best games ever created. I purchased OFP shortly after it was released and since then I have played it and played it and purchased both expansions and played more and more and I still play OFP just because it is a really really good game. Flashpoint, in my opinion, has several good points about it but there is one specific thing that I really like and that is the scale of the game. In most games you have rooms or small limited areas in which you play but in OFP you have a 1000Km island to do whatever you want to on.
Anyhow if you want to check out Flashpoint, download the demo and what not, then goto www.flashpoint1985.com and check it out.