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I found this 16min video very interesting. It's basically MMORPG PvP'er, Ed (Taugrim) Park's top 5 PvP design flaws. Although you may have other PvP design flaws in mind, when it comes to your top 5 (for me it's the PvP gear stat treadmill), you have to admit that these are design flaws that have plagued some of the popular MMORPG's PvP.
f you're lazy, here's a basic run down...
#5: 50% healing debuffs
E.g. Mortal Strike for pre-Cataclysm Arms Warrior in WoW.
#4: Asymmetrical damage scaling
E.g. Bright Wizard's Combustion mechanic in WAR.
#3: Asymmetrical CC
E.g. RIFT Pyro Mage's Ground of Strength indefinite CC immunity. I remember this.
#2: Overpowered passive procs
E.g. Lingering Wounds, Vampiric Munitions, and Fell Blades from RIFT. I definitely remember this.
#1: World PVP based on 2 factions