I watched "Upstream Color", the latest Shane Carruth film (the guy who made "Primer").
It is definitely an art film, and it is not very accessible when you are watching it. Shot on a Panasonic GH2 DSLR, and the budget was probably very low, which makes it very interesting from that angle.
The movie has very little dialog and long passages of only visuals guiding you through the story, and it has a disjointed style to the storytelling following two protagonists and their relationship to each other and others. While it might not seem like it for the first half of the film, it does have a point. But unlike Primer which had so much information you tried your best just to keep up and sort thigns in your head, this has almost the opposite approach, not giving you much information at all, making you constantly grasp at straws to find meaning in it. Unfortunately this makes subsequent viewings less rewarding, possibly even tedious, unless you fall in love with the cinematographic or acting aspects of it.
I just watched this over the weekend and I adored it.
I guess my opinion about it, along with Primer for that matter, is that Carruth's films tend to invoke reactions more like musical albums than typical movies (even typical art house movies). There's a lyrical and rhythmic aspect to everything that seems more important than any particular shot, line of dialog, or plot point.
An extreme example would be Pink Floyd's 'Dark Side of the Moon'. It's widely considered one of the best albums of all time, but it's chock-full of lengthy soundscapes and meanderings that make it generally tough to just pop in and listen to. However, when you actually sit down, listen to the whole thing, and let yourself get engrossed, it becomes something remarkable.
That said, I do agree that Primer is more accessible, even with it's complexities. There's simply more information there to process, so it's easier to stay focused. Upstream Color requires the viewer to let themselves be pulled in and swept away. It's also a much stranger and sort of vague magic bean, which I'm sure will turn a lot of people off just because it's so abstract.
I, however, ate that shit up.
PS - For the more hardcore Carruth fans among us, there is (what I believe) a really fun 'A Topiary' reference around the beginning of Upstream Color.