Lol....sorry flipply, I turn off images when browsing at work... (safer that way, haha)
Yeah, ghost strike isn't exactly something you'd use to bring down a 50 in PvP....I like to use it more or less to assist really, something to help take down an opponent faster for primary damage dealers. It's low damage, but at the benefit of not being seen (most of the time)
I just picked up the knife thrower part of the tree so I'm not that good with it yet, but combined with some of the Shadow abilities (un-bugged stuff), I think that Shadow is a good compliment to Assassin or Knife Thrower.