I just watched Nana and I must say it’s very different from your standard shojou anime. The show is about two Japanese woman named “Nana” [It means seven in Japanese. Keep that in mind when you watch the show] and their friendship. If your a fan of drama this is an anime for you. There is a lot of romance, a lot of cheating, a lot of adversity both main characters will be forced to overcome. It’s a pretty entertaining show. Personally I think its about a 7/10. I have high standards so don’t think that’s a low number.
Do note this is a plot driven story. There is little to no action or comedy. The story presents itself very seriously. If that’s the type of show you are looking for then check it out.