It's about time, too.
I hate overtext but love irony.
I found the Rogue's "Deft Strike" ability to be insanely useful. It's an at-will, so you can use it every turn.
"Before the attack, move two squares and attack." Half the time, you'll kill a monster as soon as it appears. Regrettably, this does not work well at all against wraiths...
Doesn't sound like you're using this right. Deft Strike is an attack and as such can only be used during the Hero phase. You can't use it to interrupt a monster's attack during the Villain phase.
The phrasing "before the attack" means before your attack, not before a monster's attack.