http://www.gamespot.com/pc/action/callofdutyunitedoffensive/review.html
8.9
"By turning up the intensity, United Offensive breathes new life into Call of Duty, which is saying quite a bit, because Call of Duty is an impressive game by itself. Nonetheless, this is an excellent expansion. The single-player campaign may be a bit brief, but it's packed with plenty of cinematic moments, and the new multiplayer gameplay should keep you busy long after you've blown through the single-player game. It's a no-brainer to say that United Offensive is a must-have if you enjoyed Call of Duty."
8.9
"By turning up the intensity, United Offensive breathes new life into Call of Duty, which is saying quite a bit, because Call of Duty is an impressive game by itself. Nonetheless, this is an excellent expansion. The single-player campaign may be a bit brief, but it's packed with plenty of cinematic moments, and the new multiplayer gameplay should keep you busy long after you've blown through the single-player game. It's a no-brainer to say that United Offensive is a must-have if you enjoyed Call of Duty."