In every post I've made so far I've done so having watched both films, that is not the case here. I watched 20 minutes of America and found it so boring I had to turn it off. Instead I'm going to explain why The Tree of Life might be the best film of this century.
In every film you've ever watched there will be a theme and almost universally, that theme with deal with some aspect of humanity, whether it's overcoming an obstacle, finding your love, questioning who you are, the list is endless. A good film will find it's theme and explore it, making you think, a great film might do that on multiple levels and make you question your life or viewpoint.
What The Tree of Life does is examine something so massive that it's theme is universal. The DNA of what The Tree of Life is saying can be found in every book in every book you ever read, every film you've ever seen, every tree in the ground and bird in the sky, literally everything that exists, does so within the conflicting methods espoused by Mother at the beginning of the film.
"The nuns taught us there were two ways through life - the way of nature and the way of grace. You have to choose which one you'll follow. Grace doesn't try to please itself. Accepts being slighted, forgotten, disliked. Accepts insults and injuries.
Nature only wants to please itself. Get others to please it too. Likes to lord it over them. To have its own way. It finds reasons to be unhappy when all the world is shining around it."
Throughout the entire film, you are shown examples of these 2 forces, from the creation of universes (the force of comets or the lava that simply finds the easiest path) through to lifeforms on the most basic genetic level, through to the dinosaurs and the force of the hunter and subsequent mercy, right through to the dominance of Father and the adaptable Mother. These 2 universal themes permeate everything (even it's rival film) and to be able to demonstrate that on film from galaxies down to single cell organisms is a magnificent achievement.