Just played a few hours of it, through the intro and the first mission in saudi arabia. It's brilliant for the price - if you can get past the patchy AI and (sometimes) odd controls, there's a pretty cool spy game to get your teeth into. Definitely one for people who like reading the background stuff, there's loads of story there, and the usual Obsidian character interactions and choices that affect the story, kotor 2 style.
If you're buying it as a run and gun shooter, you won't be really impressed. But if you like story in your games, defiinitely.