Why they are calling uniques Legendary:

[Bashiok]

Wouldn't you just nerf the sword?I don't know. Maybe? But maybe we like the sword being as awesome as it is. Maybe nerfing it means we have to make some awesome proc completely stupid and not fun. Or we can go *poof* unique-equipped and it'll still cause enemies to explode, which have a chance to cause the enemies they exploded on explo..

More...