That's arguable imo ... I think interviewers want to get a picture of who you are and whether you would be someone that they want to be around for the next 4 years. If they direct the conversation and don't "grill you" on your app details it doesn't necessarily mean it's a bad thing.
I know a lot of friends that have had the exact same thing happen to them and they ended up getting accepted at most of those places so I think that to make this type of statement is pretty wrong (Ex: I know of someone that did not even talk about a single thing regarding himself or his app at UPenn and ended up getting accepted ... and I have heard several other similar stories of people interviewing at other schools).
Usually, at most schools, getting an interview means that you are an academically qualified applicant and at this point, they are just trying to see whether they like you and if you fit in.