One of the greatest films I've ever seen. Some people complain about the lack of care for the characters, and that they don't link with the viewer. Attention people: they're not meant to! The depth of the character reflects the depth of their desire. Plainview just wants money, and it's cost him so much. Eli just wants people in his church - but for what purpose? It is the lack of depth in these characters' minds which is reflected, and the film on the whole is beautiful. It is a tale of everything and nothing. Wealth, ambition, greed, desire; getting money despite what it may cost.
I'm well aware the film doesn't make good viewing to everyone, but it is undeniably a work of art. And as with art, not everyone sees the same in it. What I see in it, as the director, the cast and many critics have seen in it, is gripping and thought-provoking, and if you look beyond the marmite exterior of it, I'm sure you'll find exactly what I'm talking about.