McDonald's customer satisfaction ratings are getting worse, and it's dragging the rest of the fast food industry down with it, according the American Customer Satisfaction Index Restaurant Report 2015.

The world's largest fast food chain ranked last in consumer satisfaction with a score of 67 out of 100—a 6 percent decline from last year. (Tweet this.)

McDonald's did not immediately respond to CNBC's request for comment.

Because of its size and market share, McDonald's weak customer satisfaction brings the overall industry ACSI score down, the report said. The overall ACSI score for fast food restaurants declined 3.8 percent to 77, the lowest score since 2010.

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Fellow burger chains also struggled, with scores at Burger King and Wendy's declining 5 percent and 6 percent, respectively. Burger King and Wendy's did not immediately respond to CNBC's request for comment.

"In particular, customers seem to perceive the traditional burger chains as increasingly tired brands—industry competition is fierce, and shifting consumer preferences for healthier foods is taking a toll," the report said.

The decline comes as more consumers move toward younger fast-casual burger chains, including Five Guys, In-N-Out Burger and Shake Shack, which typically offers better ingredients, freshness and more developed decor, according to the report.

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The report is the latest of a slew of bad news for McDonald's, which posted six straight quarters of decreasing U.S. sales.

Despite its attempts to create healthier options and speed up service, the chain has been losing customers to higher-end chains.

McDonald's has laid out a turnaround plan to reverse the slump in sales, but some analysts point to last month's decline in same-store sales as an indication that it is having trouble executing it.

The Associated Press reported this month that the chain planned to close more stores than planned this year. The cuts would mark the first time it has reduced its U.S. store count since 1970, according to Argus Research, which currently has a "hold" rating on the stock.