This, still needs to win the WC, don't care how you guys feel about it, but in Argentina and rest of the World, World Cup is the biggest achievement and until he's won it or anything major with the national team he won't be even considered for the greatest of all time.
Doubt he'll pass Maradona, but will most probably be the best player of this generation when he retires.
Zidane & Ronaldo last generation
Messi this generation.