Tricky GameStyle, yes, but its a tricky broken one at that. Yes, he is versatile, but all of those moves you speak of either have wonky priority or slow frame startup. Add in Lag with Namco's servers and youve got a higher yield for a loss that spells disaster.
Bring back Soul Calibur 2 Online and then we will talk.
Eh, I never found Yoshimitsu to be too effective in the older SC games.