HALO 2, perhaps the most over hyped sequel of all time.

The game fails to deliver on anywhere near the level the first HALO did.

Sure, it adds a few nice features but it takes away far more and some of the old bugs are still there.

Items can still slide under others and mysteriously vanish. Marines now sometimes vanish even in mid combat, and not by being destroyed.

There is a far shorter campaign game than before.

There are a lot more times where you just sit and watch an uninteruptable cut scene.

Some weapons have minor improvements. The Battle Rifle is arguably superior to that Assault Rifle due to the scope and the small burst fire, but for serious action it is deficient to even the old AR.

The pistol has had it's scope removed and is weaker than before, as is the shotgun, and with lower ammo capacity as well.

The rocket launcher has a virtually useless tracking feature which turns so poorly it only makes things worse.

Dual weapons can be marginally fun but you lose the use of grenades, which are still ridiculously limited to 4 of each type as if your suit had special pockets for each type or something lame like that.

Vehicles are nice in a way now that they are all destroyable but they took away the damage indicator so you now have to guess from the appearance, which you rarely see well enough.

To sum up, the game seems more like an advertisement for HALO 3 or XBOX live than anything else.
HALO 2, perhaps the most over hyped sequel of all time. The game fails to deliver on anywhere near the level the first HALO did. Sure, it adds a few nice features but it takes away far more and some of the old bugs are still there. Items can still slide under others and mysteriously vanish. Marines now sometimes vanish even in mid combat, and not by being destroyed. There is a far shorter campaign game than before. There are a lot more times where you just sit and watch an uninteruptable cut scene. Some weapons have minor improvements. The Battle Rifle is arguably superior to that Assault Rifle due to the scope and the small burst fire, but for serious action it is deficient to even the old AR. The pistol has had it's scope removed and is weaker than before, as is the shotgun, and with lower ammo capacity as well. The rocket launcher has a virtually useless tracking feature which turns so poorly it only makes things worse. Dual weapons can be marginally fun but you lose the use of grenades, which are still ridiculously limited to 4 of each type as if your suit had special pockets for each type or something lame like that. Vehicles are nice in a way now that they are all destroyable but they took away the damage indicator so you now have to guess from the appearance, which you rarely see well enough. To sum up, the game seems more like an advertisement for HALO 3 or XBOX live than anything else.