Was I just having a bad day, was I in a team where all members shared agg, a combination of the two, or are the new way that mob animations are displayed, stunned mob's mainly, making it very hard to stab mobs while tanking? (forward, stab1, back, forward, stab2, back, forward, stab3, back, etc, etc)
Sure sometimes timing is off and the perk chain times out, or sometimes you just cannot seem to get behind the mob easily, but that comes and goes, in my experience, from mob to mob. Usually though, i don't much problems stabing and tanking.
Three Pen hard missions after the new patch and i would have to say over 50% of my tanking/stabbing attempts were messed up one way or another. Prepatch, if i messed up the stab chain, it would happen a few times (3-5) a mission. Postpatch it seems to be every other mob was giving me problems.