pretty much all skills in assassination and shadow work off melee crit. siphoning is a pve spec anyways so i dont see how it is even a factor. before some of you mongs jump in and go blahblah siphoning works in pvp yadayada, yes it does work but the dps is low and its far inferior to a well played shadow/assassination NB and therefor not an option to a competitive player.
its not pointless at all. in my book 100 is more than 45 and given the nature of the class that particular crit is very important as it allows you to follow up with killer blade after the heavy attack which wouldnt be possible without the guaranteed crit from surprise attack. losing that crit prolongs the fight by minimum 2 rounds. that is ineffective.
about assassin blade morphs, well there is really only reason why u would ever go impale over killers blade and that is if ur using a bow. in that particular case yes ur right impale is viable but for any melee spec there is no reason to other go impale over killers blade.
about veiled strike morphs. its just a matter of efficiency again. theres no reason to go for concealed weapon as u can get the movement speed from either beeing a vampire (best option) or from using the set armor. the armor debuff from surprise attack is good cos the next attack in the rotation is a heavy attack which will hit significantly harder with the debuff. NB is all about maximizing ur dps so yea by chosing dark cloak and concealed weapon ur gimping urself alot.
pretty much all skills in assassination and shadow work off melee crit. siphoning is a pve spec anyways so i dont see how it is even a factor. before some of you mongs jump in and go blahblah siphoning works in pvp yadayada, yes it does work but the dps is low and its far inferior to a well played shadow/assassination NB and therefor not an option to a competitive player.