I've never found myself using Quick Strike, despite it's awesomeness. There was a lot of controversy over this an the subject of immune to player card effects enemies, but the confusion passed. Note that it's not restricted to enemies engaged with you, so Haldir, Legolas, Brand, Bard, Dunhere, or any good ranged attacker are great candidates for this. My personal favorite target is Gimli. Muah ha ha haha!
Event. Cost: 1.
Action: Exhaust a character you control to immediately declare it as an attacker (and resolve its attack) against any eligible enemy target.
"...for he that strikes the first blow, if he strikes it hard enough, may need to strike no more." Gandalf, The Two Towers
Core Set #35. Tactics.