What is your favorite ultimate ability for that class?

Everyone is criticizing the Crusader's Aura of Haven... I have a question – has anyone actually tried using it in battle, or are most people just judging it based on the skill description in the manual? Maybe if you test it thoroughly and thoughtfully, looking for possible applications, you might find something useful. After all, the path to obtaining the Crusader's Aura in 3.0 is very easy, and it's tempting...