I would rate this a 7.5 if I could. It has a message, it has entertainment value, and it isn't as ecchi as one might think from a casual glance.
The female characters are surprisingly deep and I found that I knew real-life women who could be compared to each of them. On the one hand, one can watch this show as merely being a bit of fan service, counterbalanced by a male buffoon, thus making a compromise show suitable for viewing in mixed male-female company. I take the show more seriously; I think the writers are making a point about how an old-fashioned masculine man can get along with aggressive, independent female co-workers who are *not* romantically attracted to him in the slightest. I think it's trying to make a point about modern gender roles. I could be reading way too much into it.
At the same time, it's very intertextual, which is a fancy way of saying it rips off cliches from all kinds of sources that have come before it. IMHO the writers do a great job of ripping off a diverse selection of sources -- not just swords-and-sorcery, but also murder mysteries, martial arts stories, etc.