it doesn't matter whether vidal is world class or not, lets face it Melo isn't neither, or at least he doesn't come close to representing the value we paid for. The fact is we lacked mobility in midfield for some years now, Vidal will give that mobility and added energy to the team, he links up the midfield and attack far better than Melo does, and provides another outlet, other than just relying on krasic. I'm getting tired of the term world class being used and made as our excuse for our failures, its bullshit quite honestly speaking, we've lacked balance, whilst most here want Aguero thinking he will lead us to glory by himself, Vidal on the other hand would be far more beneficial