I can believe the "God/Easy mode for demo" story. The last Gears of War gameplay walkthrough (by CliffyB) also looks easy. The enemies were rather "polite" when the hero closed in on them (So he could demo the chainsaw).
I'm generally not too hot on FPS. By preference, Resistance is one of the least interesting PS3 titles to me. Yeah... I know FPS can draw the players in very quickly once they pick up the controllers. The weapon designs will likely create many entertaining and chaotic death moments in multiplayer. Some of the areas look deep and immersive too, but there are other impressive FPSs to compare to. Will have to see this how the story and gameplay unfolds in person to appreciate.
Gears of War is 3rd persion view, so we get a commanding view of the entire scene, but slower paced. I like their color palette. I can also hear the background music and effects better in the demo. So It gives off a more cinematic vibe to me. I'm not sure about playability and replayability yet.