Just watched it last tonight (Tree of Life that is).
I'm still not quite sure what exactly to think. It had basically no narrative, but I was still somehow pretty captivated the whole way through. Pitt's performance was very strong, and I quite like how the film was shot. There were a lot of really beautiful scenes, a lot of perfectly captured little moments; but I can't deny that the film was indulgent as fuck and somewhat pretentious. I've just been reading a heap of reviews trying to get others' thoughts, and I think this one summarises my views quite well:
"The Tree of Life is profound, pretentious, art, twaddle, a cinematic event and a pompous bore all packed into 138-overlong minutes. And, in its own way, it's a must-see."