If you have A.D.D this game is not for you. It will take forever to finish/play. It does remind me of the original half-life in the fact that it will seam like it took half your life to finish it. In my opinion; you get your dollar for game play and time with this one.
The AI is just not that "I" and I found it very disapointing. I watched a video of the developers months ago about how you can play and be all stealthy. They were sniping using a silencer and somehow he got taken from behind as they put it a just so happen to pass buy patrol. After playing it was not happen to pass buy they no were you are after your first shot or stab no matter what. This is the only real problem I faced (and hated) and I could not believe they did not fix it. They new it was not a "happen to pass by patrol".
The map of play is by far massive and if this is were we are going in the future, I say WOW. use the F5 button alot and when they tell you to save do it. You may have to play an entire part all over if you don't.

I say Far Cry 2 gets a 7 out of ten (AI is important)