Probably a stupid question about daze

Daze. It's just an interrupt right? Kind of like a weak form of a stun, but you can still run away. I'm not sure I get it because I see the daze on the necromancer's war horn. It wouldnt be that useful as an interrupt because it too has a cast time. So you have to just hope your hitting it a lot faster than they are hitting whatever skill you want to interrupt and that it your daze has a shorter cast time than their whatever skill has. Someone want to give a good explanation of dazing people please?