Listen, I can see I am in a minority here but I stand by my opinion. Is Nani the best winger in the country? Arguably. Is he a good player? Yes, he is a very good player. But he is extremely frustrating, he dribbles when he should pass, he shoots when other people are in a far better position than he is... he makes the wrong decision - for me - too often.
Looking at other players who have had a claim to be the best winger in the country at one time or other, I think Nani falls short. Kanchelskis. Beckham. Overmars. Pires. Giggs. Ronaldo.