An easy-feeling first round is not automatically a bad sign. Interview difficulty can vary by interviewer, office, case, and how naturally the problem fits your strengths.

Also remember that a case can feel easy because you are doing well. Interviewers do not need to create artificial difficulty if they are already getting the evidence they need.

Do not infer the result from how hard the case felt. The better question is whether you were structured, accurate, insightful, and easy to follow throughout the interview. If useful, this guide on first-round consulting interviews gives more detail.

Mine felt suspiciously easy too and I passed. sometimes case just fits your strengths.