Well, I had an extra point that I've always wondered where to place, and I've just been tossing it into Sleight of Hand for a little extra hate reduction. After running 5-mans with our regular group, I found it to be worthless, since my friend holds hate without issue. So, I decided to give Ghostly Strike a chance. (Keep in mind, I mainly PvE, and am focused on 5-mans right now.)
Now, I don't have any sword in my inventory, so I don't have a good slow weapon to test it with yet, but it did perform with just my Whispering Blade of Slaying (1.9 speed +4 damage enchant). It was outdamaging SS with just the dagger, and it costs 5 less energy. The added 15% dodge was definitely a nice bonus, and if you find yourself having to use it (or SS) in a mutilate build, it's generally because the mob is pounding on you.
I have to say I'm thoroughly impressed with the ability for just 1 talent point. I'd much rather use Ghostly Strike when a mob is facing me and I need more CPs, verse a SS. Shiv is always an option, but it is situational, and worthless when you have a full stack of DP (and running with DP on the OH). Now I can't wait to see what it does with Vanquisher's!
BTW, since I didn't want to bother with another damn button to press, I made a semi-decent macro for using Ghostly Strike with Sinister Strike (since it has a 20 second cool down). Basically, the macro will reset back to Ghostly Strike after 20 seconds since it was last pressed. Since you can get about 5 SS's in with the standard energy regen, it will count up to 5 after using Ghostly Strike, then automatically reset to Ghostly Strike. It's flawed in that, if you hit the macro, then wait like 10 seconds to hit it again, it will reset the counter, and only be on SS #1, but since you're not using it all too often it works well. Basically it comes in handy per fight, or when you have to be clean up in special situations (like that flower guy in Botanica, killing the little flowers). Using castrandom just sucked...
/castsequence reset=20 Ghostly Strike, Sinister Strike, Sinister Strike, Sinister Strike, Sinister Strike, Sinister Strike