One place where I HAVE seen DRM work well is in pre-release protection from steam. Mostly because they don't even download the final .exe file to computers (or even have it on retail disks) until after the unlock date. And while thats a slight inconvenience, something like that I'm willing to put up with if it means they won't do some crazy thing like always online DRM.
Truth. The reality is that contrary to conventional wisdom, most PC gamers are not anti-DRM. They are against excessive and anti-consumer DRM. In my opinion, Steam has been most effective in this regard simply because it makes the paid-for versions of the games it sells more desirable to most consumers than the warez versions through the multiple value-adding features it employs. Putting good games (and if you are a fan of the genre Amnesia is better than just "good") on a good service with lots of features that many people want is the most effective anti-piracy measure around in my view.
“The greatness of a nation and its moral progress can be judged by the way its animals are treated.” - Mahatma Gandhi