I can't tell if it was franchise specific, but we have a Burger King near us in Clear Lake/Houston that is absolutely amazing. Fries are always crispy and well seasoned, the patties actually have grill marks and taste like they've been charred. The location hasn't been updated since before I moved away in 2015, and has been consistently good since 2010 or so when I first moved near it.
That said, every other Burger King around me, and near my house in Louisiana, and near all of the places I lived including NJ, NY, CT, VT have been awful. I never ate there BEFORE this 2013 change though, so I cannot comment on the quality in the before times. But my local, is amazing. Tastes like I remember it from the 90s.