Yes and no. Ice mage can freeze you in place for like five seconds and slow you, but you can still perform actions. Just about every single class has a way to completely lock out your character. Some classes like rogue specialize in stun lock kills. If a rogue out geared you he could easily kill you before you regain control because he has so many ways to stun you. I'm not sure what the current state of PvP is I haven't played WoW in a few years, but I did play for like five years. Their PvP has some pretty cheesey stuff but is far far more complex than destiny. It's hard to compare.