Sorry, I don't know your background and I'm definitely not an expert at writing essays, but I come away with these two thoughts:
- You want to use something recent, to demonstrate how you take criticism today as you will ultimately be getting some in b-school.
- It's a red flag that you haven't received any constructive criticism, even if you're a rock star. You haven't received any performance reviews with areas to improve? Keep in mind that the criticism doesn't necessarily need to be "you're bad at this," it could be "you're good at this, but you can be even better."
If you fail to use a significant recent (after high school) example, then Tuck may incorrectly interpret that as 1) you ignore feedback or 2) you don't ask for feedback. Dig deep here...if you can't find a good work example, then maybe personal criticism (from friends or family) may be relevant - if you translate it back into how it impacted your career trajectory.