Long Maul is a very heavy weapon, meaning that it can stun your weapon when you block it. If your weapon gets stunned, you HAVE to block the next attack.If you try to attack instead, and your opponent is attacking also, you will get hit first. If you played for almost 400 hours you should know the basic game mechanics (as long as 390 of those hours arent singleplayer, which also counts into the steam counter).
Also, while backpedalling with long weapon is annoying, you have to deal with it and block every attack until you are in range. If your athletics is low and you are carrying a shield, then it's perfecty possible to just kite you while smashing your face. Deal with it.
And there is nothing like stun-lock in this game, AFAIK. I have never ever seen anyone stun-locked while fighting 1v1. EVER. If you did, that means you have shield with low speed and you didnt click fast enough after recovering from previous stun.
EDIT: Didn't know about the war spear, obviously havent played enough too, and I don't see many ppl carrying one :X