A new American Customer Satisfaction Index report finds that more Americans are turning away from full service restaurants. Satisfaction with restaurants where a server brings food to your table has fallen by 2.5% since 2019. As far as full-service restaurants go, Chili Grill and Bar is America's least favorite, with a score of 75 out of 100. The chain was also America's least favorite full-service eatery in 2019, too. USA Today says customers find Chili's quality of service "lacking". Coming in at #2 on the least favorite full-service restaurant list was Ruby Tuesday, followed by Denny's at #3, Red Robin at #4 and Applebees at #5. Which full-service restaurant chain is your least favorite and why? Which one has the worst customer service?