5. Big Lots!
Denny's is widely known for alienating its customers. In the 1990s the company settled many charges of racial bias in a lot of its California restaurants and has never fully recovered from that.
3. H&R Block
They made the list mostly because of the service they provide. It has also been involved in a few scandals related to privacy and deceptive practices.
2. Phillip Morris International
Phillip Morris is a tobacco company which has had a bad image ever since courts agreed with complaints that cigarette companies hid evidence of smoking's harmful effects on health.
1. Delta Air Lines
Delta received extremely poor customer satisfaction grades due to increased delays and new charges for baggage and meals.