I totally agree, IMHO I think they look for following things during your interview :
1. If you have written your essays yourself.
2. If you have been truthful in your essays.
3. If you can articulate your thoughts well.
4. If you can handle stress (this maybe true as some interviewees did mention that the panel tried to stress them out)
Anyway, this whole process seems to be enigmatic to me. How do one quantify whole application. An application whether it has specific ingredients is decided by a human and when there are humans involved, there must be bugs involved :p...what i mean to say is, i can prepare a list by conducting an examination and fill the list with descending order of the marks...but, how do i decide a list when different humans evaluate the application and grade it according to their conditioning...eg. If X grades an application with 5, the same application might be graded 4 out of 5 by another evaluator. How does an institution checks this???
PS: Please prove me wrong and establish that it is 100% fair-chance for everyone.
PPS: I wrote this to increase my number of posts