Looking back at this election, you could say Macron had luck on his side through the whole run. First the right fell with Fillon, then the left with Hamon, Melanchon rises too late to go to round 2, and finally Marine Le Pen destroys her chances of potentially winning with her awful presentation at the debate.
In a normal election, it's clear that Macron would not have made the cut, it probably would have been Fillon 100%, with probably Le Pen and Melanchon against him. However, all these turns of events helped Macron take the place of president.
That luck is gonna be reflected during the legislatives. He won because he was against Le Pen and not really for his project. I personally like the man, but even I can recognize he won as a default choice, not because he could change something. If anything, he is gonna be a meatshield for 5 to 10 (if he gets re-elected somehow) years until the new election where either the normal parties will take back their places, or an extreme (either Melanchon or Le Pen) will take the place of president.
So, all in all, while Macron wins the 1st and 2nd round, it is highly unlikely that he will win the 3rd one (legislatives), UNLESS luck is on his side again or he actually manages to have a majority of the government be with him.
Guess what I'm waiting for now is to see if Macron backs his luck with actual skill. He already showed some, let's hope for him that he actually manages to make his changes instead of facing a brick wall like Chirac back 2002, who also won against the FN back in the day and had cohabit with the opposition.