A line from the assassin design diary caught my eye:
"With D&D combat, the tension is highest at the beginning of the fight (when players and monsters have a full array of resources) and lowest near the end (when players are out of resources and monsters are dwindling)
I think that the wizards designers are working from a false premise. Now I like the assassins power mentioned in the original post and in general I'm fine with powers that don't kick in until later in a fight (especially for monsters), but I disagree that tension is highest at the start of combat because all combatants have full resources.
The start of combat is when a monster is best able to withstand a daily or encounter. A few rounds in after hammering a foe with daily/encounter they are often then put down by an "at will" and "at wills" are no longer the 3.x and prior boring "I swing my weapon doing damage X"
Tension should be higher as the combat progresses, resources dwindle and the outcome hopefully balanced on a knife edge
