I much prefer real mashed potatoes.. I don't peel them, and I add salt, pepper, garlic powder, milk, sour cream, and a bit of ranch dressing before blending them with a hand mixer.
BUT.. I do use potato flakes when I don't have the 45 minutes it takes to make "real" ones, as in, late getting home from work and the kids need to eat. I also keep them on hand for if I accidentally add too much milk to the real ones, just to thicken them up. I don't like liquidy mashed potatoes.