iRobot Project Manager interview questions

It's a typical interview process for a product manager role 1)HR call - one or two calls 2)Hiring manager interview 3)One day with multiple interviewers (product managers). They asked me to be prepared for a case

One of the worst interviews I've had and I thought I would love the people based on awesome products they produce. The interviews were not conversational and had a very strict ('robotic') methodology. There was no flow in the conversation, just onslaught of questions drilling down at you. Did not enjoy the conversation with some of the senior members of the team. I feel like I avoided a horrible corporate culture and management.