From your moniker, I'm guessing that you use the WAIS-IV. Can you point me to the empirical data indicating that it "improves treatment outcomes"?
It's simply scientifically dishonest to claim that there are no validity data for the Rorschach. E.g.:
http://psycnet.apa.org/index.cfm?fa=buy.optionToBuy&id=1999-11130-005
My favorite part of that interchange is in the followups from Woods and Garb trying to lecture Robert Rosenthal on conducting meta-analyses....dudes, he literally wrote the book.
Despite their obvious slant, even Woods and Garb acknowledge the validity of the Rorschach for certain purposes:
http://www.srmhp.org/0202/focus.html
So, if you're a neuropsychologist, certainly thought disorder would on occasion be a critical differential diagnosis. What thought disorder assessment do you recommend based upon "empirical data"? The Rorschach has extensive research support for this purpose, as acknowledged by Garb and Woods. What has more?