YSL was an artsy mess, so I suppose it's fitting that this film is as well. It looks gorgeous and has a great time rubbernecking Yves's hedonistic ways, but it's also pretty mean-spirited. It doesn't attempt to understand Yves or what drove him or his creative process. He's just a rich, spoiled jerk in this film.
Also, I enjoy a good nonlinear art film, but they are hard to pull off. This film is very hard to follow if you don't already know YSL's biography and work, and there are many long, pointless scenes that are supposed to be symbolic but don't really add up to much. It does have some fantastic performances and great set pieces, and if you like reveling in 1970s hedonism, you'll enjoy it on that level.
Sometimes formulas and conventions are a good thing. The rival film to this one Yves St. Laurent may be far more conventional, but it is at least coherent and has genuine empathy for Yves and Pierre. Plus, it features the actual clothes Yves's designed.
If you're a student of fashion, it's fun to compare the two films, but I think the more conventional one wins the day simply for being a more pleasant experience to watch.
