Sucess of what? Not piracy prevention. There are 12,162 seeders and 21,034 downloaders of AC2 on the first torrent site I looked at. They have a DRM server emulator and re-direct all URLs to localhost. Cracked. Just like that!
I won't buy a game with this kind of DRM nonsense. So, success? Yes, they succedeed in making me not buy the game I had pre-ordered (now cancelled).
Piracy went through the roof when games stopped having any intrinsic value. Games went from boxed collectables, to a bland DVDs in an empty generic plastic case. This was several YEARS before internet broadband and game downloads were possible.
You cannot download pewter figurines, mousemats, posters, (good)manuals, keycards etc.
In the meantime, rewarding the pirate and punishing the paying customer is not in any sense a "success" unless your agenda is to kill the PC gaming business.
DRM isn't free. Drop it and pass on the cost saving. Cheaper game AND no DRM? Who WOULDN'T buy it? THAT would be a success..
There are 10 types of people in this world. Those who understand binary and those who don't.