Currently, it better to rely on the mob's actual cast-bar than the marker itself.
On some fights, particularly those involving many players, you might not see the marker until it's too late. If you're familiar with the enemy's mechanics however, and remember to look out for their cast bar, it's typically pretty easy to get out of the way in time.
Of course, this is coming from a tank. It's my job to be on the lookout for casting.
On some fights, particularly those involving many players, you might not see the marker until it's too late. If you're familiar with the enemy's mechanics however, and remember to look out for their cast bar, it's typically pretty easy to get out of the way in time.
Of course, this is coming from a tank. It's my job to be on the lookout for casting.