Story - 8/10. The episodes are mostly self-contained, so there isn't much "story" going on besides the premise: some friends in a fantasy world decide to go to brothel after brothel, and rate their experiences with monster girls. That premise however is why I rate the show so high because I think it's creative and bold.
[Visual] art - 7/10. It's good; by no means an eyesore, but by no means exceptionally beautiful either. It's definitively a step or two above hentai in this regard.
Sound - 7/10. The intro song is catchy and really good, but otherwise it lacks luster.
Characters - 5/10. There isn't much to see here: your average man, your exotic elf, the angel who cares about feelings, and... that's it. They're shallow and should be seen less as characters and more like plot devices or running gags. (Specially the angel. He's the laughing stock of the group.)
Enjoyment - 8/10. You know what? This is fun. By no means exhilarating or "OMG! I laughed so much my sides went into orbit!", but it's still more than a simple "I'm bored, let's watch this".
Overall - 7.2/10 (see note). It's a good anime and if you're into ecchi you should watch it, but if it doesn't "click" with you don't worry - you aren't losing much.
Note: In case you're wondering why not 7.0/10, I put a bigger weight in enjoyment and treat art+sound as a single criterion.
