Diablo 3 after the removal of the cancer that is Jay Wilson

[Myth]

While the online DRM Diablo 3 uses is more effective than other DRM in curbing piracy, it is in no way full proof. A quick google search brings up nearly two year old pages with posts and links to client server emulators for Diablo 3.
Sure they probably don't work very well and might be a pain to setup, but the hard boiled ones will still play the game inspite of all this, without paying.

They don't work and blizzhack or whatever that site was called stopped trying a few months after release. You could at most strut around in New Tristram and the game crashed when you tried going out, from what I read.