This game delivers on all the fronts that it promised and ends up being an amazing final package.
Literally every single aspect of the game has been improved upon including the graphics, which are now a bit brighter which is a good thing because, although the environments in Gears 1 were impressive, they were at times dark and uninteresting, whereas now there are extremely visceral environments along with huge scale areas and you are not always cramped.
There is one complaint that I have with the game, and it was a complaint I had with Gears 1 as well, and it is why I have taken of 0.5 from its perfect 10. Most people have more than one friend, so it only makes sense that games are made to support the maximum number of players that the console can handle, in the Xbox 360's case, 4. It is frustrating when we have to take turns playing Gears 2 because it is only 2 players local. Every mode (campaign, versus, and horde) are only 2 players local. Most people do play online now however the multiplayer experience is often at its best when played locally, which is where Gears 2 and 1 fall short.
The bottom line is that this game is a must have if you are a shooter fan, or a good game fan. If you have played Gears of War 1 and enjoyed it at all then this game is a must buy. Although I would recommend buying it new because it includes codes for 5 maps that they carried over from Gears 1 that are not available without the code. This game is awesome and perhaps my favorite game for the console of 2008.