Applied via on campus recruiting & received an interview offer within days. One of my interviewers was fantastic, and the other was terrible. I was told that "We need to investigate this further" was a legitimate decision for a market entry case. I was under the impression that it was better to come to a decision that went one way or another, and to simply justify it. Not sure if this is dependent on your interviewer, but just an option to keep in mind. My other interview was a simple market sizing/profitability case. However, my interviewer kept asking me irrelevant questions to throw me off, then became impatient & disinterested.