This game can be summed up in just two words. Absolutely amazing! This is easily one of my favorites games ever!
The campaign is solid, compelling, and extremely fun. Even in the first level, you can realize just how much work they put in this game. They made every minor detail count. The only thing I don't like about the campaign is that even though the ending levels to this game is fun, it can't quite match the rest of the game. The sound in this game is great, especially the voices, mainly of Jack Carver, David Doyle, and Valerie Cortez.
I have had some of the most fun I have ever had in FCI's multiplayer. All of the pre-made maps are fun, and the multiplayer is very balanced. The game itself will have you to playing for at LEAST 50 hours without getting bored or frustrated of it. But, if the actual maps somehow get boring, which will take some time, you can create your own with the simple, yet complex mapmaker. I have spent WAY too many hours making maps, and it never gets boring. As much fun as it is, it takes patience to get good, and an average map (one without many flaws, and one that looks good) takes anywhere from 6 to 16 hours to make.
Of course, every game has it's flaws, including the almighty Far Cry Instincts. The physics are definitely off; you get hurt from fall damage way too easily, ATV's are almost impossible to flip back up, and you get run over way too easily, you can crouch and get up really fast, which leads to some really annoying players online laying down, jumping up, etc. The mapmaker doesn't have any ziplines, turrets, or bots, either. Also, sometimes the computers are a little too stupid, and sometimes they are a little too unrealistic (they know where you are when they shouldn't).
But, the great aspects of the game easily overtake the few minor flaws, and make this one of my favorite games, ever. Get this game. Now.