Cue "zomg France" claims.
By 1940 France was bankrupt, broken, and backwards. Construction of fortifications like the Maginot Line as well as the Depression financially ruined France. Things were so bad it didn't even take Nazi Germany's presence for threats of a government collapse prior to the war.
A huge section of French industry and infrastructure had been wrecked from WW1 and were *not* rebuilt. Which was a major reason for possessing the Ruhr. Finally, even though France had "won" the Great War. You wouldn't have known it from people's attitudes. The reality was most French citizens felt like WW1 had been a totally Pyrrhic victory minus the victory part. Many of had lost family members and friends during the war and their was no great urge to participate in the next one. Remember the Strategic Reserve that saved France in World War 1? Can you guess why they didn't have one the next time around?
Finally, France had spent very little time preparing its Army for war because as it turns out, some countries were trying to move on from the Depression without murdering millions and millions of people. Given all these factors its astounding how anyone can think France was a "strong" country during the war.
Five years of fighting against England and it's colonies, the US and Soviet Russian and getting all the way to Moscow, aren't small achievements.
Yes they are. Especially when you realize the things Germans had to give up for the Nazis to turn their country into a slave of the military-industrial machine.