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.
Base Breaker: Photopia was, in many respects, this for the Interactive Fiction community at large: some praised its beautiful plot, characterisation, and writing, while others decried its apparent lack of interactivity or puzzles. This gave rise to a lot of the "Story vs. Game" controversy that goes on in the IF community today.
Fridge Brilliance: Half of what Photopia is about will only hit you after a few play-throughs.
Mary Sue: Even the author admitted Alley was a bit too much of this.