There will be no real PvP system

[Malakar]

My point to the entire thread is: the EULA contains warnings about greifing and ganking, right?  There's a simple way to, if not prevent, then lessen greifing.  Ban/Suspend the accounts of griefers.  So do your part: report the griefers.  Bug Blizzard until they do something about a griefer.
Quark
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This might work for a few griefers, but not for most. It'd have to be based on the number of unique reports, so only the most dedicated griefers would get punished. Otherwise it'd open the door for abuse of false reports for account suspensions/bans.

So, it might help with the infamous griefers, but not with the random encounters with people much higher level than you.

Problem is, though, that Blizzard can only do so much manually. It might not be enough to make much of a difference given the massive numbers of players. If they were to automate it, that opens up the possibility of potential security issues. It'd be risky, what if there were security exploits that allowed someone to ban whomever they choose?