I haven't seen a single casting that isn't easily avoidable yet, even though the game is new.
I have been in a lot of situations where avoiding a spell was difficult to impossible. For instance, yesterday I got invaded while in one of the Dark levels where it is all narrow passageways and narrow ledges with pits on either side, so there is no way to roll left or right.
You also need to factor in the effect of lag, which means that you basically have to guess at when to time your rolls even when you have room to roll.