There isn't much to say that you don't already know.
There aren't many bad words I can say about this game, the Campaign and Co-op are perfect, the only thing that lets this game down occasionally, and I stress the word occasionally, because this doesn't happen very often, is the problems you have with on-line multi-player, I'm sure people who have played this game on-line know what I'm talking about so there is no need to repeat it. Horde, a brilliant addition to the game, especially now as these multi player games are becoming more and more popular.
This is a game, everyone should own. Gears of War 2 delivers an enjoyable third person shooter series unlike any before.