I don't think FIFA nominations are to be taken seriously anyway.
But, i think you have it the other way around. If it was someone not Messi and not Ronaldo who played like Messi did, people would have said that he played "well". But because it was Messi, and because it was so low compared to his usual high standards, a lot of people consider it to be a bad performance.
But to be honest, if any player other than Messi did some of the thing Messi did in the WC and created as many, chances and goals, people would say that player played well.