Burger King has been going downhill for years, has poor management, has opted to knocking off Wendy's value menu(chili, nuggets, small shakes,sm cheeseburger,etc..) , and though now serving a nice Angus burger, it still appears on the slide in the "burger wars", despite Pepsi money.
Glaken, BK was started in Fla by a Long Beach man, and probably was on top of their game in their home market, as I also remember them being good as a kid, also buying my McD fries to go with my BK Whopper, but they're bad everywhere I go now.
Of the chains, Jack-In-The-Box's shakes are supposedly the only ones made with real milk/ice cream, but they are average in my estimation, as In-N-Out, Fatburger, Whataburger, Backyard Burger, and Carl's Jr are better options when in the "I need some junk food" mode.