Ok if you said, "it's because you are NA playing on a Canadian Server" or anything of the like, What do you propose that the European players do? Its obviously a problem if you need be on a server near you, and there are no servers on your continent. Same goes for Western Asia and Australia, and a whole lot of places.
If it requires you to be on a server within your locale then they need either shorten the server ping, or put servers everywhere. I play with a 100 meg connection and there are times when I have enough time to get out of the zone, because I am already sprinting, then turn away and cast a spell and still be hit by the move. As a healer, no you can not see the cast bar that is also an issue that needs to be addressed because it is a move targeting you, maybe knowing how much time you have would help because you can't tell if its lag or the move has a long animation.