This game has been forgotten because it was a movie tie in released a week before CoD: World at War. It's also called Quantum of Solace, but like 80% of the levels are just retelling Casino Royale.
The single player is short and largely forgettable, but the value was always in the fantastic multiplayer. There's still plenty of people playing it on Live, and Treyarch proved that a cover mechanic in the CoD engine can work great.