It's an interesting system. 2 rounds. So you get to signal your displeasure with the 1st round and then everyone comes to their senses and rejects the right when actual consequences are on the line.
I'm pretty sure that if the UK and USA had that system, there would have been no Brexit and no Trump.
Not familiar with the French election process but what you see a lot in Europe is that there's like a million different legitimate parties not just 2 like the US. So all of the left-wing parties in France united and formed a new party and won. Interestingly, there was still a party called the French Communist Party that went in on this though that's a pretty insignificant party.
Wished these countries would govern down the middle. Everyone wants to be either extreme-right or extreme-left.