You can find a complete list
HERE.
The list is pretty long and includes LineageII, Aion, Exteel, and The Chronicles of Spellborn to name a few.
The opinion most people have is that it is garbage and fails to do what it was designed to, in addition of being invasive, causing system instability, and being hard to remove as it is a root kit. But that doesn't mean that it is true, that's just what I've heard on various forums.
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"Only two things are infinite, the universe and human stupidity, and I'm not sure about the former."
~Albert Einstein