Play the game, or dont play the game. Its that simple, if you are pissed about the one hit kill moves stop playing then. Myself, i occasionally use them when the situation presents itself...but you dont see me walking around backwards hoping for some random person to run behnd me. (i am not pointing fingers here, i am just using that as an example)
And btw...they arent that hard to avoid, when i see a guy jumping at me ready to dfa me, i just roll out of the way...problem solved. If i see a person running around backwards...i just toss the saber at them or run in for a couple quick hits and kill them.