There seems to be a general opinion on this board that defeating opponents by any methods other than hit point attrition is overpowered and must be prevented at all costs.
Mostly it is because dazing can be attached to spells targeting any save which means you dramatically increase the chances of success, way beyond what you might otherwise expect.
It is also one of the most debilitating conditions in the game because it directly affects the action economy. It is significantly better than stun as whole swathes of enemies (undead, oozes, plants, elementals, constructs) are not immune to it.
It can also be attached to spells which do not allow SR or which persist over multiple rounds or can be moved vastly increasing their power. Dazing Aqueous Orb is utterly lethal to huge swathes of the battlefield, dazing Wall of Fire spells death to anyone caught in it who doesn't have high levels of fire resistance and a single feat can get around that issue.