Pretty much what it says- I've been playing a rogue at the endgame for awhile. Conventional wisdom when I first made the rogue was that crippling strike was crucial, but I can't say I've noticed a major effect from it. Then again, I've always had it, so perhaps I just take it for granted? Obviously opportunist is the new must have, but does anyone play without crippling strike in favor of, say, an extra skill mastery?