One Simple Trick I learnt For Validating a Great Offer

Few years ago, I was helping my friend's medical aesthetic clinic to analyze when she has so few customers. She handed out over 500 one-page brochures but very few people took the offer. So we began to interview a few people in the target audience group. After reading the brochure, one person said one thing that I still remember up till today: "What's so exciting about this?" Ever since then, I always ask myself this question whenever my offer/ad/landing page is not working. Do you have other ways to remind yourself on making great offers?