Personally I found this to be a very refreshing series to watch. Isekai no Seikishi Monogatari is a fantasy, action harem which manages to blend all of these genres together into an outstanding anime.
I enjoyed the fact that unlike most harem anime's out there, the main character has many skills and a personality to deserve the favorable attention he is given. The anime doesn't have accidental groping at every turn, and the story is not riddled with 'awkward teenager syndrome', by which I mean the interaction between Kenshi and the various women is not full of blushes, misunderstandings and enough innuendo to make most people irritated.
It is a spin-off the Tenchi Muyo series however it is a completely watchable series even if you have had no exposure to the rest of the franchise (I hadn't when I first watched it).