Worth another 15 bux? No way man. Even if the new maps are really good, you're still playing BO. New maps cant help the game improve itself. It's frustrating because it's just little things IMO. If they would have just let the people who PAY MONEY for servers configure them the way they want, the game would be awesome.
The game itself is actually good IMO, it's just the inability to configure things such as teamkilling, spawn times, round times, score limits, adding fav servers, having good RCON access, etc.