I'm seeing this movie for the 5th time on the weekend, lol. I don't know what it is, but I just love everything about it. Didn't find it slow or boring at all.
There are so many subtleties that make this film even more wonderful when you notice them, and I don't think anyone could have handled it better than Ang Lee. I mean, did anyone notice how Ennis switched the shirts at the end, as if he's now protecting Jack somehow? And when Ennis is bathing and Jack is peeling the potatoes you can see Jack swallow and grit his teeth because he's trying so hard not to look, something you just don't see the first time around.
I love movies where you keep noticing small details the more you see them.