Ok everyone: take a sit and listen up. This be one of my all time fav mangas (and animes) right here-- has been since I was in middle school. But I don't rec it to everyone because of a couple reasons, so here we go:

Story: 10

I love the story, what can I say? There's action, there's comedy, there's plot twists, and some serious stuff going down. I love the supernatural powers, the inclusion of historical aspects (like WWII and witch hunting), I loved the inclusion of tarot cards (in a later arc)-- it's fantastic. A main reason I don't rec it to some of my friends who really enjoy supernatural and action genres and who I know would really enjoy the involved plot and amazing story writing, is the ecchi. If you can't handle some ecchi, you probably won't like Get Backers. No matter how great everything is, if you can't get through the bountiful panty-shots and gravity defying boobs, you won't make it through Get Backers.

Characters: 10

Holy crap, I love the characters. You learn about the characters all throughout the series, as if you were slowly becoming friends with them. While this is a supernatural and action manga/anime, I'd say the main component in Get Backers is character development. While the main characters (Ginji and Ban) seem to be pretty stereotypical characters to begin with, the more you read, the more you find out about them, the more complex they get as characters. Their relationship in particular gets more complex. If you live for slowly finding out about characters' dark pasts, then you've come to the right place. If you want immediate gratification, this isn't the manga for you.

Art: 7

I'm going to just come out and say it: the art isn't the best. It looks and feels old (which is what some people really enjoy, but I tend to avoid). Especially in the beginning of the series, the proportion is strange. Small heads on large bodies is the main thing. Kind of think CLAMP, but not that extreme. That being said, I really enjoyed watching the mangaka improve. As I continued to read the series, I really became attached to the art style. You see later the proportions become better, Ban and Ginji don't look quite as young, and the art in general undergoes an impressive transformation. All in all, it's really endearing to me (which may also be from nostalgia since this is one of my long time favorites). If you're really put off by old art, this isn't for you.

Overall: 9

If it was me just judging this based purely on my enjoyment, this series would be a 10, but I'm not. Just because this series was my cup of tea, I know it's not everyone else's. By no means is this manga perfect. Basically, if you don't mind old styled art with ecchi and moe, and love a fantastic, involved plot with supernatural and action (heavy on the supernatural), and love becoming emotionally attached to characters via character development and past unveiling (yeesss dark pasts), then this is manga for you. If you don't like just one of those traits, you may want to look else where =)