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Winterfox:
I'm sure you don't mean to say that no one should express negative opinions of any given book, though

Correct - free opinion is very important. If taken and meant as singular and subjective. What I dislike about literature critics is, if they turn into popes and call out a dogma. We've got 2 main "popes" in Germany - and I've seen them rip books apart in a terrible scavenging way - was not about the plot or even the author, it was to tickle their ego, feel and express power.
I agree with the reviewer you quoted - and I think "being drawn into a world" is similar to the journey I explained - an intimate matter between author and reader => it succeeds in some cases and doesn't in others. I was drawn into the novella - you weren't => singular, subjective, c'est tout in both cases.
Kiya