The storyline is about the fall of Raul Menendez. Although we are given a glimpse into what turned him into such an asshole, not much else is revealed about him in the game. Personality-wise, that is. But we see as soon as we meet him in-game that he is obviously a lunatic, and the further you go the crazier he gets. Suddenly he’s just a bat crap loon and all you want to do is blow his brains out. That’s all well and good, but I like for the antagonist in a game to try to convince me of why his way is right. Not just be crazy as hell and bent on killing because the voices tell him to.
The one thing I did like about the main campaign is that the storyline changes with your actions and decisions. Choosing whether to keep this non-drone A.I. character alive or plug him one can have an effect on the rest of the game. It actually makes you want to play the game again just to see what would happen if you let the guy who acts like a jerk die early on. Except I would have to play it again and see what would happen if I had protected him. I didn’t like him at all, and I let him catch a bullet at the earliest opportunity.