Every giant country is confident: Brazil, Portugal, France, Germany, etc, Argentina isn't the only confident team, and they aren't going to win the tournament with their confidence only. Argentina are contenders for the World Cup, but they are not top favorites in my opinion, there is Messi who is probably playing in his last World cup tournament, and if it is up to his teammates, they will want to win it for him, but that desire alone doesn't win tournaments. I feel this year may be Brazil's turn to win the world cup once again, they have a scary attack, and a very balanced team, and there is Neymar who is very hungry this year, i will be happy if he wins it.