That may be, but a rapid fire + roman cancel + unblock-able = This works mainly with Sol, Ky (iirc), Raven, Izuna, and Valentine.
Bombs can be fairly obvious, and stun grenades are... meh. Landmines near the enemy masterghost AND have them spawn on it = win.
I have to play defensive with Sin because a whiffed 4X, unlock forward X, or 2X will leave me completely open to a 200+ point combo.