One-word description: Addicting
I mean like the GTA Series addicting. Most of my free time goes to playing the game. It's a challenge to the point that it can get VERY frustrating at times. There's a good mix of easy and hard levels and they tend to get progressively harder overall.
I haven't gone all the way through the game, but from what I have done of it, I'd give it a 9.5 so far. A definate buy, although people who don't watch 24 may not get it.
And if you don't watch the show, go get the first two seasons on DVD and watch them before you play the game, as it's set between seasons two and three, so you'll know all the backstories of characters before you play.
And there's no Nekkid Mandy. Yet.
No, she's not nekkid in that pic.