Everything is spoilers. So first of all Denzel Washington is a great actor and I've never seen him be bad in anything. This movie was no exception -- if you're looking for a good movie re:actors, Flight nails it.
But I think this is the second time in a row Denzel Washington has tricked me into watching a religious movie. I mean, the commercials made it clear that this movie had a lot to do with alcoholism. They did not make it at all clear, though, that it was about the struggle between drug abuse and salvation through God. It was basically an ad for AA.
(The other movie I'm referencing, by the way, is The Book of Eli, a post-apocalyptic action movie in which (SPOILER!) It turns out the book is the Bible, and it magically grants the main character the ability to survive all sorts of ridiculous challenges as though he were sighted.
Last note: The lawyer is great. Seriously, Don Cheadle is awesome.