People still complain about the "darkness"? I could see the movie just fine with my 20/20 vision back when it came out to theaters. It makes me wonder if this darkness thing is just some hater bull crap that actually gained enough support. I'm not fond of the movie myself but I'm also honest.
No I wouldn't buy it, not because I think the lighting is fine, but because it's painful enough that I bought the unrated version when I despise the movie. It is just 'there' as a 'historical document' serving as a reminder.