I saw the film this evening. And I was not sold to their vocal abilities at all (PARTICULARLY Russell Crowe's).
That might explain my first impression that the extras' vocals were much better than the leads'
I'm sorry but people who keep complaining about the vocals of the film obviously STILL don't get the point.
Tom Hooper wanted to showcase more of the acting and the emotions in the film version, and decided to record the vocals live during the filming. He could have opted the easy way out by auto-tune them to death and use studio recordings instead, Chicago style.
Personally I find Hugh's half singing half speaking style in most of his solos to be extremely effective. It showcases Jean's raw emotions that no one on the stage production would ever manage to do.
Bottom line is, This is a movie. I want to see the acting. If I want to be entertained by perfect vocals I'll head to West End.