I also vote on potatoes...I read that it's not necessarily the potato that's bad for you; it's eating more than you should, not to mention how it's cooked, and especially what you slop on top of it.
Personally I eat them very rarely; I am a huge fan of sweet potatoes - I just zap them, then spray some I can't believe its not butter spray on (just a couple sprays), then sprinkle with cinnamon and nutmeg mmmm. Sometimes as a dessert I'll do the above, and top with a sprinkle of fat free granola and fat free whipped topping; just like pie, only healthy!
Whenever I do have potatoes, I top them with some veggies I sauteed in a drizzle of olive oil - stuff like zucchini, carrot strips, bell pepper, red sliced onions, then mash in some homemade roasted garlic - soo yummy. then I pair it with a nice big salad to slow down the glycemic reaction.
what I've found is, what makes white flour/carb stuff have a bad rap, is the glycemic index (you can find one online). Basically that is how fast your body turns it into sugar when eaten alone. Stuff with a high number would be corn, potatoes, and white flour products (ie bread and crackers). And eating stuff that has a high glycemic index with lots of roughage apparently slows down that reaction, so your body processes it slower, and thus the rate of conversion to sugar is reduced. And keeping your blood sugar steady, even if you're not diabetic, is a great way to stay on plan, and keep feeling great.
Sorry to go off on the path like that LOL, but I do hope that helps ya.