This is what I think of when I envision world PvP. It's not evenly pitched battles that raged for hours between Taren Mill and Southshore (did those really ever exist?), becuase that generally was just a handfull of 60s making life difficult on toons trying to level in the Highlands. Same goes for Crossroads raids. LOOK MA, I KILLED THE FLIGHT MASTER LOLOLOLOLOL!
Anyway, this is my vision of world PvP - and I think deep down inside, it's what most of us consider to be successful PvP as well. Remember, unlike sex, PvP is ALWAYS consentual. There are no grey areas in this discussion, no room for debate. Cry foul all you want at the fact that you just got rolled by someone 4 times your level, the point here is you consented to the treatment you're now recieving.
Play on a PvP server and left your starting zones? Consented.
Flagged for PvP? Consented.
Entered a PvP zone (enemy capital, Baradin Hold, Gurbashi Arena, etc, etc)? Consented.
Attacked someone (by hook or by crook, you still did it) who was flagged as PvP? Consented.
Put a post up on the world forums stating your intention to hold a mass gathering of folks in a PvP zone, on a PvP server, then added the line "Please don't come mess this up"? Yeah - you consented.
Ambushing a group of players when they least expect it. "That's the way dad did it, that's the way America does it, and it's worked out pretty well so far" (Tony Stark).