The premise of the series is pretty neat and interesting. Each story takes a look at human nature, the injustices that exist in today's society, and our desire to take revenge even though it can't bring back what's already lost. Many people rely on Jigoku Tsushin and Jigoku Shoujo as a way out of their problems, even though in many instances the problem could be resolved by talking it over or by other means without having to condemn your soul to Hell. The crimes of the victims going to Hell varies, some deserve it more than others (and I admit it's very satisfying to see those who have it coming get their due). Whether Jigoku Shoujo is right or not in what she's doing is up to the viewer to decide.

unfortunately, by the second episode it was already getting on my nerves. The same process over and over again, like a 'monster of the week' thing, except it was 'victim of the week'. bah.

also, it is clear who is the 'good guy, bad guy'. this anime is tagged as 'Psychological', but it isn't. It tells you what to think, it tells you who to side with. To be rated PSC, an anime must require DEEP thought. want a sample, try death note. you will be toyed with like a piece of string- now THAT is psychological. psychology is also used in Gundam Seed, where it is not clear what is right or wrong. meaning you can't go brain-dead and float off in the middle of the episode. be forced to think for yourself.

what annoyed me the most was how they handled character development.

The consequences of selling your soul to the devil is a concept that's been used and abused over time. However, this time there's no tricks, double meanings, implications, or fine print. The caller of the Jigoku Shoujo is told outright what awaits them should they make a contract with Ai, and even given a glimpse of hell so the decision isn't taken lightly. Fully understanding the consequences, they choose to make a contract anyway.

This series is not for everyone though. Some will find themselves uncomfortable with being confronted with the question of whether revenge can be justified or not. Some simply will grow impatient with the extremely slow pacing of the series. However, for others those factors will make this an instant favorite.