I'm back across the pond in the UK. On the flight over, American Airlines gave me a packet of Ocean Spray "Craisins," which are called "sweetened dried cranberries" on the front. On the back, Ocean Spray boasts that they are "surprisingly sweet."
Given that Ocean Spray sweetened them, why would we be surprised that they are sweet? Maybe what they mean is that we'll taste them and say, "Good God, I never imagined that anyone would sweeten cranberries this much!"