Earlier quoted context omitted.
My favorite is seeing 5 star reviews that are hijacking the top to complain. I've also seen 1 star reviews that are exalting reviews. But my all time ongoing pet peeve is how recommendation engines especially on video streaming and video game series use numbers and star systems that are not based on any other human's input. Not a critic, not a user score, just an algorithm's confidence score on similarities.
The 1 star review that loves the product but hated the way it was shipped. Someone needs to write a textbook on the pathology of those people.
If the product is good, but the shipping is not, buyers deserve to be informed.
If there are separate reviews for the product and the shipping of a product (still tied to that product, but also the shipping carrier that was used for that order) then a split review (one for each) is legitimate. Otherwise if there's only one review spot, EVERYTHING is on the table.