I try to get out of LOS of them, so they hvae to come to me. If they are stupid, they run in sight and attack and guard WTF-PWN them. If they are smart, they just wait for me to come out in the open. Guess what, then I can fight back. Just like mobs in an instance, use LOS to pull them.

My 2 crappy opinions. I think guards should be insta-killing machines on both sides. They should insta-kill anyone that casts, even if it is a heal or a defense move. Guess what, you would learn to not go to town and fight real fast.
Next as other people say, PVP happens. I think you should randomly die every few minutes on a PVP server. That is just incase there isn't a person there to gank you. That would teach you real fast to not complain about players killing you, since it happens anyway. If you don't like it, go to PVE server.