I watch film of the old greats all the time, and the thing they have in common is just their domination of the opposition, whether it's from their dribbling ability, their tactical awareness, or strength speed and desire. Messi does it just like Maradona, Pele, Zidane, Garrincha, Ronaldinho etc all did it.
I also think he will be a much better leader for Argentina in the World Cup, add to that he's even better than the last one and Argentina as a squad are getting their act together. I would like to see him win a World Cup but if he doesn't I'll still consider him tied up there with Maradona and Pele.