:edit: I always use /follow /assist in almost all my melee attack macros
I have 5x rogues, and was shadowstep for a long time, till I switched to Mutilate. I'm going to go back when I start playing them again though. My main concern with shadowstep was (this applies almost always just to mobs, not PVP) when activated on all characters at once, the first char that did the shadowstep/ambush would cause the target to insta-turn to face the attacker.
The problem comes (mostly with lag i think) on the alts, they sometimes ended up in front of the target with the main, and unable to perform the positional attack. It was just much easier to use the non positional attack (mutilate) and run through the target while spamming on all 5 characters.
The Mut nerf will make me go back to shadowstep, and on my alts I'll probably do a castsequence for the opening attack that consists of: /castsequence ,shadowstep, ambush.
The first comma will give me a split second delay for the mob to be in the correct position as the alts each come in for the attack. The main will always be using cheapshot for an opener on my chars.