The restaurant chain wants to revive sales with a new look and food offerings, but many are upset that nostalgia isn't on the menu

When shares of Cracker Barrel fell as much as 15% Thursday in a backlash over the restaurant chain’s logo change, it may have seemed like a golden opportunity to get in on an undervalued stock. After all, a new logo doesn’t change a company’s fundamentals, and it might be worth the gamble if the uproar quickly blows over.