Tough call. He was a good general in impossible conditions in WWI, and then thought it better to head the rump France than to have Nazis rule directly. He was wrong, but understandably so.
I’m sort of with you on this. In addition to being a great WW I hero, I think it’s worth considering that he was also nearing his dotage around the time of WW II. He was born in 1856 (do the math to 1940... 84 years old). BTW, he died in 1951 at the age of 95.