Bare in mind we haven't seen swiftfeet (when activated, sins essentially have MirBoots effect until time passes, lasts around 30secs iirc) which is going to be sins most devastating spell for pvp yet. For those unclear, you flinch, but you keep running when hit. You never walk. Ever. If I am a wizzard or an archer or a tao, I am going to be scared shitless of a sin with this spell.
Lets also swipe aside the fact you're already the highest dps class in the game (due to haste giving capped a.speed) and can green poison any mob/boss you please by yourself. (The rankings for level already show this)
So your PvE is godlike. I think any sin will agree with this. You by far deal the most damage to a boss providing you have enough suns to tank its damage, or another person there to share the damage.
Your PvP without swiftfeet, admittedly, isn't amazing - just average. But lets consider what happens when you do get swift feet. Any ranged class is now ****ed, when a decent sin gets a hold of this spell. For the duration of swiftfeet, no matter what they do to you, you're still going to get next to them and kill them.
On TOP of screwing over almost all ranged classes (lets be real, nobody will ever beat a decent tao 1v1 with pets but maybe a sin just might do it with all their spells available) you now also want to be able to out-pvp a warrior?
Don't you think you're asking for a bit much? The fact you already have a 30% chance or a 80% chance (depending on if the warr has any accuracy with them on hand or on kit) to dodge a warriors attacks is pretty damn good.
I just think you've misunderstood the entirety of your class, or obviously haven't seen the beta videos of sins with swiftfeet.