I wouldn't say French car's are less reliable than the normal Euro box's, merely that they require more work to keep them as reliable, especially in relation to electrical issues. That said if you remove wear and tear related issues (clutch, belts, CV joints, gaiters, head gasket, shoes/pads/disc's, exhaust system, manifold - it always cracked on C1!) from the list of things that we had to do to the ex's car then that only left the dodgy coil packs (well known issue), dodgy earth points (very well known issue), stupid fuse locations under the scuttle tray that corroded (notice a pattern here) and the intermittent issue with the p/s rear light cluster.
That said I ended up buying a French car known for electrical issues and water ingression after a few years of Japanese reliability.