Well. All a question of personal taste, isn´t it ? Everybody choosing his/her own drugs, eh ?
I was actually very much impressed by part one. Will certainly watch it again - this time trying to disable the audio & play some decent ambient instead ... just trying ...
I liked all three parts. Every part is focussing on a different theme, but in their approach and technique they are similar. Personally, my favourite is part one. But that might be, because it was the first movie of that kind, that I ever saw - so it was a very new experience ...
You know Baraka as well ?