Frederic March was too young and too hot
I think he's a wonderful actor, but he was miscast here as Jean Valjean. He looked way too young for the role. Why, when Cosette was a teenager, he looked like he could have been her lover! I also have a problem with the fact that he wasn't... dignified, grave and tragic enough, if you know what I mean. I still like him, but an older, more experienced actor could have made the film more accurate and interesting. I had a hard time identifying this fresh-faced pretty boy to the rugged, self-sacrificing Jean Valjean.
If you want to see a really good and sadly pretty unknown interpretation of the character, check out Harry Baur's in the Les Misérables french version that came out the year before. It's my favorite up to date. Truely an excellent film.
http://www.imdb.com/title/tt0025509/
P.S. I also have to mention the cinematography was pure gorgeousness. Greg Tolland knew his stuff.
I don't pray, really, because I don't want to bore God.