Maradona and Pele are definitely better than Messi. At least they won a World Cup, while that juiced up tax evading garden gnome needs his butt buddies Iniesta and Xavi to be fully functional
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I could write a whole book on this but don't feel the need to do so i'll just let you with this: Talent is talent no matter what era. Some real WC players of the past would be considered gods among men if they played today. The only 2 things that can't really be compared is how better physically players are today (given that they get better medical facilities and high tech equipment) and their sharper tactical awareness.
Marchisio is not even one of the best of this generation in his position.

Marchisio is a very good player, a solid midfielder with a lot of positive traits and attributes, but world class he is not.
He lacks the talent, consistency, and dominating presence to be considered a truly WC player. Midfielders like Pirlo, Vidal, Iniesta, Schweiny, and Xavi have been consistent and influential throughout the years that they deserve such a label being attached to their name.