My favorite is that I perfectly land a hit with my black knight greatsword, but even though I watched my weapon clip through his body, the invulnerability during rolling means I did 0 damage. Meanwhile, he is able to perfectly backstab me from the side during my roll and take off 2/3 my health and get the rest with an AoE spell that kills me while I am still on the ground going through the stupidly long standup animation.
There is a reason that I don't care for this game's pvp. Because it is really REALLY poorly made, it is built explicitly for stupid BS ganking, and the terrible netcode and collision detection all compiles into the horrible mess that we have.