A startup idea that 90% of people like is probably not ambitious enough; aim for one many people reject for the same reason.

But if you calibrate your idea so that 90% of people like it, it’s probably insufficiently ambitious—and you are overvaluing feedback and neglecting faith. You should be aiming for an idea that a lot of people reject for the same reason, and you should have faith in your ability to overcome that specific issue better than anybody else.