Dreamgirls is one of the worst movies of all time. It's amazing how many idiots out there liked this film. I heard it even won an Oscar (i used to watch the Academy Awards, until Crash won Best Picture - at that point, i knew the awards were bullshit). Giving that chick from Dreamgirls an acting award is like giving Adolf Hitler a humanitarian award.
But all that aside, there is one good line in it. The girl wants to make a record and she learns that there is a Martin Luther King record being released. And she says something like, "Can he even sing?" That's a good line. The rest is shit.