I've posted this question in the "Returning; open for questions" thread, but I thought that an independent thread on this topic may be in order, as I haven't been able to find one specifically on PhD admission interviews (please correct me if I am wrong).
I have talked with a few PhD students on this topic and have received wildly different responses. An American that I talked to said that in his experience, PhD interviews aren't really "interviews", they are more like an attempt by the people in the department to try to convince you to come to their school (i.e., they have pretty much made up their mind to select you by the time of the interview). On the other hand, I talked to a couple of foreign students and they said that they were grilled on their past classes and even made to critically analyze a journal article and report back a few days later (i.e., the results of the interview matter when they are deciding to admit you). All of these students were from the same PhD program and of the same "caliber", but they didn't have the same interview experiences.
Any current PhD students care to weigh in? What can we expect in a PhD admissions interview? Thanks in advance.