These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Broken Base: Emi's Jerk Ass attitude towards Maou irks many viewers. Others find it hilarious and/or justified.
Episode 7 worsens her status. Is Emi punching and kneeing Maou hilarious or did it show how much of a bitch she is to Maou? Take note that Maou saved her from falling to the ground.
She's generally hated on /a/
Some "fans" seem to vehemently insist that the inclusion of an Harem nature into the anime is dragging it down, despite there not actually being a Harem and only one girl openly in love with Maou. Anything to do with Emi and the other girl concerning Maou are only misunderstandings, results of flawed cultural osmosis or not what they seem to be.
The whole series is this to those fans under the misconception that it's supposed to be High Fantasy and that the Slice of Life elements are hampering it down.
Is Chiho hilarious and heartwarming? Or is she annoying and controlling? Some fans think it's the first, while others think it's the latter.
Sleeper Hit: Before airing, no one was really looking forward to this series. The first episode's great humor changed everyone's mind. As the series continued, everyone enjoyed the humor, action and characters. It was popular enough to get 9th in Newtypes most popular anime for the year of 2013.