In fairness, it's not just nostalgia.
If you're old enough, you actually had better donuts at Dunkies. They used to make them fresh at the store, now they are brought to the store from central locations. In addition, they make them in a much more ... healthy ... way, which makes them taste terrible.
Short version- if you had Dunkies in, say, the '90s, and you ate it now, it's not just nostalgia. They do taste different ... like cardboard.
DunKings- Drink our good coffee, 'cuz our donuts ain't .... expletive.