Another view on this, is that the "daily power" is not so much an ability that the character consciously uses, but more of a special circumstance that simply allow the character to apply his natural skill. In narrativist RPG theory, these mechanics could be seen as "shared narrative authority", a controlled way of allowing the players to narrate events that normally fall under the GMs narrative domain.
In other words, the mechanics allow the players a little bit of the freedom to describe the outcome of attacks that normally only GMs enjoy, and the rules describing the powers, their damage and how often they can be used are metagame restrictions to prevent the players from simply declaring: "I win!". Thus, a "Dire Wolverine Strike" is not a special move that a Ranger has trained and perfected, in Kung-fu movie style, but an in-combat event that just occasionally happens when that character is fighting.