Paladin skill angelic icon

Whats the deal with it ? I saw ppl on this boards sayin it the skill for the Paladin.
Now that my Paladin can use it i dont see the big advantage in it. As far i can tell it raises pdef and attk speed a little for 1 minute then it needs 10-20 mins cooldown.
Does it get better later ?

It's a skill like UD, you use when your in greate danger, not a skill you use to normaly grind with.