Sounds interesting. Personally, I think Obsidian is getting better with each new game. NWN2 had fewer bugs than KOTOR2, and actually had an ending. MotB didn't have any big bugs, and seems to have been generally well-received.
I was one of the lucky people who managed to avoid any major bugs in the unpatched NWN2, so that might color my opinion. But I've always liked their games, and I look forward to their future titles. I'm not sure how well a secret agent RPG will work out, but at least it's different.