It's not bad mission but I prefer "Just My Luck" to both "Hunt" and "Show Off". It is small but use it's space more effectively and has more original and complete story albeit featuring linear keyhunt which is not good. With "Show Off" in particular I felt that it was too huge and vast for its own good (especially in city).
I also like this mission. It was a bit linear at first but then I liked the dynamic story and changing locations in it. The vague non-standart and not-so-connected storyline was also quite refreshing. The starting area was harder than other parts - with its forced ghosting - but I didn't find it impossible or that frustrating as some of the commentators here or on TTLG. I think that problem with that area lies in forcing player to play certain playstyle (ghoster) which might not suit his/her ...
I personally haven't played Cube Escape series (maybe, in future), but if you like Coaxing the Spirit, - there is another FM Rose Cottage (also for Thief 2) by Saturnine - it is also big puzzle horror mission with distinct graphics and atmosphere (at least until the Big Reveal). Another a bit similar mission is Eclipsed by HipBreaker (for Thief 2, more open horror city mission). Some Haplo's missions (that series that begins with Unholy Vivid Innocence)...
I quite like zombies because they are different from so-called "living opponents". They react differently, express themselves differently. While I clearly understand that it may be confusing and enraging for many people, it refreshes gameplay and makes in more variable: I need to develop other tactics, listen to reactions of them because I should understand where and when they are noticing me. It is different experience overall. So I have no problems with rating of "Where the Unknown Lurks"))...