Actually defense does matter the p ring is the perfect example defense bonuses work. Quote from wiki
"Protect from Melee is accessible at level 43 Prayer. When used, the player will become immune to all Melee attacks used by most monsters; however players should note that some monsters do have the ability to hit through Protect from Melee. The prayer will also reduce the melee damage taken from other players by 40%."
Also stop using these forums and use new ones.