I agree with this. I thought there was a missed opportunity to have Mirror Lorca be somewhat changed from his Prime experience, and understand that the Empire had to become a little more like the Federation to survive. Instead he just became a raving ethnofascist, which is somewhat less interesting.Frankly I'm very much of the opinion that Lorca was originally supposed to be S31 and not Terran. I was really hoping the Mirror Universe "hints" were just a red herring (the scars on the back, the jump in episode 9, Not remembering some event in the past). It wasn't until Episode 11 that they really telegraphed it super hard though. (The light is duller here duuur, Lorca's smirk)
The thing is, the Mirror Universe doesn't really gel with Lorca. If he was this crazy racist xenophobe, why was he working with Saru and respected him? At no point is it shown that Lorca is racist until this episode where he becomes a Space Hitler. For most of the season they just coded him as largely a competent, professional wartime captain, not a Mirror Universe sociopath.
Honestly, I thought much higher of the writers than I should have. I didn't want to believe Mirror Universe Lorca because if they did both Ash/Voq and Mirror Universe Lorca, then they would be bigger hacks than I could imagine, but no, it was exactly that.
I'm not a fan of S31, but I would have preferred it (or Starfleet Intellegence) over Mirror Universe Lorca. S31 fits the character, Mirror Universe doesn't. The Lorca this episode was nothing like the Lorca seen in previous ones.
I get the intention was to shadow T'Kuvma - "Remain Human" - but that didn't really come across here, because it's not as if Emperor Georgiou wasn't doing that already. He just wants to be even more brutal than her to crush the rebellion, which makes him significantly less interesting than he previously seemed.