I have to completely disagree with you, OP. My favourite is costa, but then again, I only ever drink black coffee, none of that crap with tons of milk and sugar. Worst is Starbucks for me. Nero is very bitter but I don't mind THAT much, so it's about in the middle out of those three. Mcdonalds black coffee is really good too IMO. Think people should mention which kind of coffee they actually drink from those places.