From the PlanetXbox360.com feature article:
"As I write this, it has been a couple days since I experienced the Mass Effect 3 demo, but that doesn't mean I haven't stopped thinking about it. Ever since I left that demo room, I've had thoughts and feelings about it swirling about my head. This game matters so much; it will be the ending of Shepard's story, but I suppose I never really considered that the ending may not be all that happy. The demo was an amazing feat in and of itself: it planted the seed of doubt in my mind that Shepard might not be able to overcome the Reapers without making a few sacrifices along the way. Will it even be possible for Shepard to manage to keep all the squad members alive like in Mass Effect 2? There have never been guarantees in the Mass Effect realm, but things have largely been in your hands."