How much power does the president has? Does he need the support of the parliament? As far as I know "En marche" was founded ten months ago and is not represented in the parliament. Is it similar to the USA where the president needs the congress and senat for passing laws?
The president chooses the prime minister. The prime minister selects the rest of the government. The government governs France. Laws are voted on in both chambers, house of representatives and senate. The president's main role, beyond choosing the prime minister (typically from the parliamentary majority), is in international relations and as commander in chief.
German politicans and media endorse him, but some politicians from the left party think that he is neoliberal and has no intention of changing the EU.
I think macron would be a terrible, terrible president, who would perpetuate most of the problems France has developed over the last 30+ years.
So, a hell of a lot better than most other favorites.
Edit: So is fillon starting to completely lose his shit? After "journalists don't get to pick the questions" from a cple of days ago, now it's "yes, there were other attacks, read the [nonexistent] police reports!" Pressure getting to him much?