Just won Gears of War on "Hardcore" (Medium). Fun game. I swear there's a couple places where the Theron Guards are cheating with their torque bows - there's no way they could have hit me from where they were. Actually, the number of "luckiest shot ever" occurances went way up compared to "Casual" mode.
AI Dom is so endearingly useless. He's like a lost little puppy. I lost count of the number of times I had to revive him just in the final battle. Even funnier because often I'm frantically commanding him to come back, but he keeps telling me: "Negative!" - and then he gets fragged.