If im not mistaken, gcd is 1.5sec. If u manage to pop 3 abilities in 2sec, u probably has alacrity gear, which sux for shadow. Also using backstab (shadow strike) without proc is waste of resources.
And yes, kick stun is crapy opener, but we have no other choice (i use forcesslow as opener in 95% situations).
And sniper is easiest target for shadows.