I never go with imdb ratings...that's just where a bunch of fanboys vote either 10 or 0 (and trust me, most guys would just vote 0 on this film without even seeing it). It's a bit of a joke when people are voting up 'Pirates of the Carrabean' with 10's and giving 1's to masterpieces like Ikiru just so it climbs up the list. Character driven films almost never get high ratings at imdb. I usually just go with rottentomatoes.com. They compile about 200 professional reviews (that actually have to say something to back up their opinion) and most of the industry seems to go with rottentomatoes as well. And the general concensus for both these films (Sin City at 78% good reviews, Sisterhood at 82% good reviews) is that they are decent (though not great) films. This trend effects indie films the most....The film 'Charlotte Sometimes' , a $10000 picture, is at 80% on rottentomatoes.....It's at 4.5/10 on imdb....I thought it was one of the best films of the year (Top 50ish).