I love my Xbox but do admit that I've never played Gears of War. I'll be picking up a copy soon to get ready for Gears of War 2.
I thought the biggest complaints about Gears of War were that it was too short and the story was weak.
So, what does this mean? "Gears of War 2 is real, and it looks every bit as formidable and impressive as we hoped. It's bigger and better than before, and the people making it are insistent that you'll be playing it in its entirety in just over half a year." -Game Informer
Drop in and drop off for second player sounds cool.