I thought Grey was very good in this. I honestly do not understand why people thought her acting was bad. Her performance was so natural and conversational that all lines delivered by other actors seemed overly forceful and theatrical.
I recommend the alternate cut, available on the DVD. By removing the ongoing discussion amongst the airplane passengers, Soderbergh makes the relationship between Christine and her boyfriend much more direct. The focus - as voices drift over static, often blurred images of empty, expensive apartments - creates something almost hypnotic, if not genuinely suffocating; the entire film becoming a blue note of despair.
The film seemed promising but the film overall was lacking!
Not really a fan of Sasha Grey and I don't really see her as a "high-class escort." The film doesn't really delve into any topics/issues really... it just seems like "yeah, it's there, in the world"--that's it.