Take this example:

This is a review chain for a tourist attraction, somewhere in the world (an island with a lighthouse that you can visit).

There is a total of 6 reviews, and all seem to have a general consensus of being generally excellent (5-stars).

Then there is this muppet at the bottom here, who felt the need to say that this particular island is the worst island he's ever been on – but not say a single word about why.

Was he expecting a desert, but ended up on this lush grassy island instead? Did he not like the tour guide? (in which-case why did he feel the island needed to take the brunt of it?), Did the island somehow injure him? (was it really the island though? or rather an involuntary act of self-harm cause by the sudden onset of stupidity?).

The mystery may never be answered, and some random dullard has now caused the island to receive an average of 4.3 stars. You know what beats an island with 4.3 stars? The one with a 4.4 star rating, which might be the reverse problem – an island that only deserves 4 stars, but has a few 5 star reviews thrown in for good measure.