Most recently, Little Debbie oatmeal cream pies. I used to love the things and they were a nostalgic part of growing up, so I randomly decided to buy a box a few weeks back.
Took two bits of one and threw the whole box away. They were nasty. Chemically tasting, dry, full of little hard bits from poorly milled oats, etc. pure garbage. And this is not a matter of my tastes changing. I remember exactly how those are supposed to be, and the modern version is crap.