You guys need to learn how to dodge AOE in this game so here is the tutorial...

There is a cast bar that goes with every aoe. IF any part of you is even remotely in the AOE at the end of that AOE you will get hit. You can keep running and be 3 million feet from the end by the time the move actually goes off (*after cast animation) but you will get hit by it.

The damage DOES NOT register based on the cast animation, instead it registers based on when the cast bar ends.

There is no delay, there is no server latency (you may personally have bad internet but thats not SE's problem) I promise you I have done every dungeon in the game and if you are out of the red mark when the cast bar ends you will not take the damage.

The problem isn't the game it is your skill/reaction time. Don't blame the game for your short comings... just handle it like an adult and get better.