The backstab in its current form is rediculously overpowered. It's impossible to defend, way to easy to perform, and deals entirely to much damage with the more powerful weapons. It should be an optional play style, not a neccessity for all pvp matches. And whats with this "punishing" concept people keep trying to use? Are you trying to say getting wide open hits on somebody isnt enough punishment when somebody makes a bad move, you also need to get 50-75% more damage from your hit? And since when do you have to have a backstab to kill a mage? Backstabbing is simply a way out for people who are not as good as the person they are facing.
Dragon hunting covenant. Joining the covenant adds a bunch of dragon bosses into the game and you level up by killing them.