Apparently it was a different coding problem that broke the game mentioned previously, not the DRM. On the other hand, anything that's checking with Central Command to be sure you're playing the game the 'right' way is likely to cause such irritation. It doesn't really matter whether it's checking for "Is the game stolen?" or "Is the player cheating?" or "Has the player applied a nude patch?"
Anti-cheat mechanics are important in a multiplayer environment where you want to try and ensure a level playing field. But single-player, shouldn't people be able to cheat if they want to? Why should the game feel obligated to check?
I know nothing about Gears of War, I admit, I may still be misunderstanding.