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Pros
Pro The revival system is much better than in the first game
In Gears 2, not only can your AI companions revive you and get you back in the fight, but you can tap "A" in order to crawl to them more quickly. It makes life a little easier, and the game a little more fair on the tougher difficulties.
Pro Some weapons have been changed, while others have been added
Weapons have been balanced more properly: the shotgun was made more powerful, the pistol got a little kick in the power department as well. They've also added new weapons, the flamethrower and the mulcher (a huge chain machine gun) are the two most notable additions.
The flamethrower is great for burning down Locust that get too close for comfort. The Mulcher, though it takes a few seconds to get going, can tear through even the most powerful enemies with ease.
Pro The cover system has been notably improved
The cover system has been revamped so you cling to cover more accurately, meaning you're not going to be catching as many stray bullets for no real reason as you would in the first game.