I had the cheddar, and they kind of grew on me after a while. It was one of those things where the first one is "Eh," but you look down 20 minutes later and realize you've eaten half the bag.
The original flavor of Ritz Chips is the most addictive snack food you can wish for. All the other versions just have some flavored powder sprinkled on the chips, adulterating their perfect flavor.