Let's start by saying that I watched the anime, and after that, I wanted to know how the story ended so, I dug into the mnga, and it was totally worth it. Honestly I don't get why's there so much hate towards this particular series, I found it to be quite enjoyable.

Story: 6
So here we go Again.
guy meets weird girl.
She happens to be an alien.
They're bound through some sort of ceremony and then cute girls fall everywhere around this apparently boring regular guy.
The typical harem-ecchi-comedy plotline.
Except, that this one focus on the mysteries of a species sumissive slaves, the DearS, and the mythical "gift" that gives one of them the right to choose their master.
I gave it a 6 because the story kinda drags itself trough the volumes, only to climax real suddenly - though with a great ending- in 2/3 volumes.

Art: 7
Notmuch to say there, love it, specially the chibi skits that popped really often through the manga.

Character: 7
You get to see ll the characters grow, as the manga takes awhile to develop, you kinda get attached to all of them, and in a way you can see how the dearS kinda "humanize" themselves, while interacting with the human species.

Overall: 7
It's a light manga with lots of funny stuff that's really great for when you want to relax and read some light story with some ecchiness involved.