When a game world is just FUN to move around in, it can make even the dullest mission design a hoot. This game starts to veer towards overly serious in some aspects of the story but for the most part it's just a blast to fly around knock off Malta in a wingsuit and blow shit up.
I don't know why, but blowing things up in these games has always been really boring to me - and that's supposed to be the selling point, it really doesn't have much else going for it besides that. Looks pretty.