It's crap in GOW 3. In the first Gears of War I loved this weapon many battles was fought over the sniper rifle. It was great for headshots and active downs and in Gears of War 2 it was still ok but not as good as the original GOW.
Now in the Beta I hardly saw anyone even use it. I can't remember even being killed by it. I tried using it a few times but to be honest I prefer to pick up the Boltok Pistol it's like a sniper rifle lol