Agreed, he's turned out to be expensive for the goals return. For whatever reason, probably the physical nature of the English game, Nando hasn't been a success. But it's not because he's not world class. There are plenty of world class players that wouldn't be as successful in England. The same argument could be made by a certain team who just paid 17 million for a striker who's been injured half the season. On the flip side Darren Bent is hardly world class, but he's knocked in 20 plus goals this season.