Antonomasia’s review published on Letterboxd:
Pierrot Le Fou is great-looking: bright colours pop in pop art interiors (a little messy and lived in, unlike the showhouse in Blow-Up) and the Mediterranean haze of sea, shrubs and sand is so edenic you can practically feel the sun on your skin. And of course it stars Belmondo and Karina.
Otherwise, there isn't an awful lot to it. There are a few things to spot and analyse if you like, but essentially this is a lovers on the lam movie, triggering memories of True Romance and A Life Less Ordinary, though there are slightly fewer corpses and more musical numbers than in the 90's pictures. The songs are pretty good too. I didn't once check how long it had to run, meaning it must be more fun than an awful lot of films.