Stop complaining! You get a MS effect that's on a 5.5 second cooldown by spending 5 talent points.
We get it by spending 3 talent points.
Sure we have an advantage because we already take Permafrost as frost mages, but you have Shadow Form which greatly reduces all damage you take. With the changes to resillience it's even more outstanding. Also, most of your damage comes from dots, hence you do not suffer as much as a Mage when you are getting chained by a melee. Dots continue to do damage even when you are not casting/stunned/silenced. Frostbolt/Ice Lance doesnt.
And as many have already said, it's still on the PTR, a lot can change.