Fun, but you need patience.
I loved the game, but only from Ghost's perspective. You don't drive vehicles as Ghost, but you shoot stuff. Niobe is the driver, but her levels are noticably harder. One level that I couldn't get past was one where she is one a plane, and your task is to protect some dude from being killed. Well, at the start of all levels, a grenade comes out and tries to kill you. This grenade kills the man, and you fail before the mission can begin. So, I only played the game as Ghost. The guns seem the same to me, and the levels seem to get repetitive as early as the third level. All said and done, enjoy this while you can. Something better is just around the corner.